diff --git a/Fill.py b/Fill.py
index f695bd9a..4ebd4c04 100644
--- a/Fill.py
+++ b/Fill.py
@@ -9,7 +9,7 @@ from BaseClasses import CollectionState, FillError, LocationType
 from Items import ItemFactory
 from Regions import shop_to_location_table, retro_shops
 from source.item.FillUtil import filter_locations, classify_major_items, replace_trash_item, vanilla_fallback
-from source.item.FillUtil import filter_pot_locations, valid_pot_items
+from source.item.FillUtil import filter_special_locations, valid_pot_items
 
 
 def get_dungeon_item_pool(world):
@@ -360,22 +360,53 @@ def distribute_items_restrictive(world, gftower_trash=False, fill_locations=None
 
     # get items to distribute
     classify_major_items(world)
-    # handle pot shuffle
-    pots_used = False
-    pot_item_pool = collections.defaultdict(list)
+    # handle pot/drop shuffle
+    chicken_pool = collections.defaultdict(list)
+    big_magic_pool = collections.defaultdict(list)
+    fairy_pool = collections.defaultdict(list)
+
     for item in world.itempool:
-        if item.name in ['Chicken', 'Big Magic']:  # can only fill these in that players world
-            pot_item_pool[item.player].append(item)
-    for player, pot_pool in pot_item_pool.items():
-        if pot_pool:
-            for pot_item in pot_pool:
-                world.itempool.remove(pot_item)
-            pot_locations = [location for location in fill_locations
-                             if location.type == LocationType.Pot and location.player == player]
-            pot_locations = filter_pot_locations(pot_locations, world)
-            fast_fill_helper(world, pot_pool, pot_locations)
-            pots_used = True
-    if pots_used:
+        # can only fill these in that players world
+        if item.name == 'Chicken':
+            chicken_pool[item.player].append(item)
+        elif item.name == 'Big Magic':
+            big_magic_pool[item.player].append(item)
+        elif item.name == 'Fairy':
+            fairy_pool[item.player].append(item)
+
+    def fast_fill_certain_items(item_pool, location_types, filter_locations, matcher):
+        flag = False
+        for player, pool in item_pool.items():
+            if pool:
+                for certain_item in pool:
+                    world.itempool.remove(certain_item)
+                cand_locations = [location for location in fill_locations
+                                  if location.type in location_types and location.player == player]
+                locations = filter_locations(cand_locations, world, matcher)
+                fast_fill_helper(world, pool, locations)
+                flag = True
+        return flag
+
+    def chicken_matcher(l):
+        return l.pot and l.pot.item == PotItem.Chicken
+
+    def magic_matcher(l):
+        if l.drop:
+            pack = enemy_stats[l.drop.kind].prize_pack
+            return pack in {3,7} if isinstance(pack, int) else (3 in pack or 7 in pack)
+        return l.pot and l.pot.item == PotItem.BigMagic
+
+    def fairy_matcher(l):
+        if l.drop:
+            pack = enemy_stats[l.drop.kind].prize_pack
+            return pack == 7 if isinstance(pack, int) else 7 in pack
+        return False
+
+    reshuffle = fast_fill_certain_items(chicken_pool, [LocationType.Pot], filter_special_locations, chicken_matcher)
+    reshuffle |= fast_fill_certain_items(fairy_pool, [LocationType.Drop], filter_special_locations, fairy_matcher)
+    reshuffle |= fast_fill_certain_items(big_magic_pool, [LocationType.Pot, LocationType.Drop],
+                                         filter_special_locations, magic_matcher)
+    if reshuffle:
         fill_locations = world.get_unfilled_locations()
         random.shuffle(fill_locations)
 
@@ -459,6 +490,7 @@ def distribute_items_restrictive(world, gftower_trash=False, fill_locations=None
 
     if world.players > 1:
         fast_fill_pot_for_multiworld(world, restitempool, fill_locations)
+        # todo: fast fill drops?
     if world.algorithm == 'vanilla_fill':
         fast_vanilla_fill(world, restitempool, fill_locations)
     else:
@@ -468,7 +500,7 @@ def distribute_items_restrictive(world, gftower_trash=False, fill_locations=None
     unfilled = [location.name for location in fill_locations]
     if unplaced or unfilled:
         logging.warning('Unplaced items: %s - Unfilled Locations: %s', unplaced, unfilled)
-    ensure_good_pots(world)
+    ensure_good_items(world)
 
 
 def calc_trash_locations(world, player):
@@ -484,7 +516,7 @@ def calc_trash_locations(world, player):
     return gt_count, total_count
 
 
-def ensure_good_pots(world, write_skips=False):
+def ensure_good_items(world, write_skips=False):
     for loc in world.get_locations():
         if loc.item is None:
             loc.item = ItemFactory('Nothing', loc.player)
@@ -494,12 +526,23 @@ def ensure_good_pots(world, write_skips=False):
             loc.item = ItemFactory(invalid_location_replacement[loc.item.name], loc.item.player)
         # can be placed here by multiworld balancing or shop balancing
         # change it to something normal for the player it got swapped to
-        elif (loc.item.name in {'Chicken', 'Big Magic'}
-              and (loc.type != LocationType.Pot or loc.item.player != loc.player)):
+        elif loc.item.name == 'Chicken' and (loc.type != LocationType.Pot or loc.item.player != loc.player):
                 if loc.type == LocationType.Pot:
                     loc.item.player = loc.player
                 else:
                     loc.item = ItemFactory(invalid_location_replacement[loc.item.name], loc.player)
+        elif (loc.item.name == 'Big Magic'
+              and (loc.type not in [LocationType.Pot, LocationType.Drop] or loc.item.player != loc.player)):
+            if loc.type in [LocationType.Pot, LocationType.Drop]:
+                loc.item.player = loc.player
+            else:
+                loc.item = ItemFactory(invalid_location_replacement[loc.item.name], loc.player)
+        elif (loc.item.name == 'Fairy'
+              and (loc.type != LocationType.Drop or loc.item.player != loc.player)):
+            if loc.type == LocationType.Drop:
+                loc.item.player = loc.player
+            else:
+                loc.item = ItemFactory(invalid_location_replacement[loc.item.name], loc.player)
         # do the arrow retro check
         if world.bow_mode[loc.item.player].startswith('retro') and loc.item.name in {'Arrows (5)', 'Arrows (10)'}:
             loc.item = ItemFactory('Rupees (5)', loc.item.player)
@@ -510,7 +553,7 @@ def ensure_good_pots(world, write_skips=False):
 
 
 invalid_location_replacement = {'Arrows (5)': 'Arrows (10)', 'Nothing':  'Rupees (5)',
-                                'Chicken': 'Rupees (5)', 'Big Magic': 'Small Magic'}
+                                'Chicken': 'Rupees (5)', 'Big Magic': 'Small Magic', 'Fairy': 'Small Heart'}
 
 
 def fast_fill_helper(world, item_pool, fill_locations):
diff --git a/ItemList.py b/ItemList.py
index 2e7f0040..67e06644 100644
--- a/ItemList.py
+++ b/ItemList.py
@@ -10,6 +10,7 @@ from Fill import FillError, fill_restrictive, get_dungeon_item_pool, is_dungeon_
 from PotShuffle import vanilla_pots
 from Items import ItemFactory
 
+from source.dungeon.EnemyList import add_drop_contents
 from source.item.FillUtil import trash_items, pot_items
 
 import source.classes.constants as CONST
@@ -423,6 +424,9 @@ def generate_itempool(world, player):
     if world.pottery[player] not in ['none', 'keys'] and not skip_pool_adjustments:
         add_pot_contents(world, player)
 
+    if world.dropshuffle[player] == 'underworld' and not skip_pool_adjustments:
+        add_drop_contents(world, player)
+
 
 take_any_locations = [
     'Snitch Lady (East)', 'Snitch Lady (West)', 'Bush Covered House', 'Light World Bomb Hut',
diff --git a/Items.py b/Items.py
index da9d7385..8c27bf88 100644
--- a/Items.py
+++ b/Items.py
@@ -1,5 +1,3 @@
-import logging
-
 from BaseClasses import Item
 
 
@@ -176,6 +174,7 @@ item_table = {'Bow': (True, False, None, 0x0B, 200, 'You have\nchosen the\narche
               'Blue Potion': (False, False, None, 0x30, 160, 'Delicious blue goop!', 'and the blue goo', 'the liquid kid', 'potion for sale', 'free samples', 'bottle boy has blue goo again', 'a blue potion'),
               'Bee': (False, False, None, 0x0E, 10, 'I will sting your foes a few times', 'and the sting buddy', 'the beekeeper kid', 'insect for sale', 'shroom pollenation', 'bottle boy has mad bee again', 'a bee'),
               'Small Heart': (False, False, None, 0x42, 10, 'Just a little\npiece of love!', 'and the heart', 'the life-giving kid', 'little love for sale', 'fungus for life', 'life boy feels some love again', 'a heart'),
+              'Fairy': (False, False, None, 0x5A, 50, 'Just a pixie!', 'and the pixie', 'the pixie kid', 'pixie for sale', 'pixie fungus', 'bottle boy has pixie again', 'a pixie'),
               'Beat Agahnim 1': (True, False, 'Event', 999, None, None, None, None, None, None, None, None),
               'Beat Agahnim 2': (True, False, 'Event', 999, None, None, None, None, None, None, None, None),
               'Get Frog': (True, False, 'Event', 999, None, None, None, None, None, None, None, None),
diff --git a/Main.py b/Main.py
index d77f6f58..2db44f17 100644
--- a/Main.py
+++ b/Main.py
@@ -23,7 +23,7 @@ from DoorShuffle import link_doors, connect_portal, link_doors_prep
 from RoomData import create_rooms
 from Rules import set_rules
 from Dungeons import create_dungeons
-from Fill import distribute_items_restrictive, promote_dungeon_items, fill_dungeons_restrictive, ensure_good_pots
+from Fill import distribute_items_restrictive, promote_dungeon_items, fill_dungeons_restrictive, ensure_good_items
 from Fill import sell_potions, sell_keys, balance_multiworld_progression, balance_money_progression, lock_shop_locations
 from ItemList import generate_itempool, difficulties, fill_prizes, customize_shops, fill_specific_items
 from Utils import output_path, parse_player_names
@@ -304,7 +304,7 @@ def main(args, seed=None, fish=None):
             customize_shops(world, player)
     if args.algorithm in ['balanced', 'equitable']:
         balance_money_progression(world)
-    ensure_good_pots(world, True)
+    ensure_good_items(world, True)
 
     if args.print_custom_yaml:
         world.settings.record_item_placements(world)
diff --git a/PotShuffle.py b/PotShuffle.py
index fd59f6cc..ec6536ef 100644
--- a/PotShuffle.py
+++ b/PotShuffle.py
@@ -1041,11 +1041,12 @@ class PotSecretTable(object):
         self.multiworld_count = 0
 
     def write_pot_data_to_rom(self, rom, colorize):
-        pointer_address = 0x140000  # pots currently in bank 28
-        pointer_offset = 0x128 * 2
-        empty_address = (pointer_address + pointer_offset)
+        pointer_address = snes_to_pc(0x09D87E)  # pots currently in bank 9
+        data_bank_address = snes_to_pc(0x09DACE)
+        # pointer_offset = 0x128 * 2
+        empty_address = data_bank_address
         empty_pointer = pc_to_snes(empty_address) & 0xFFFF
-        data_pointer = pointer_address + pointer_offset + 2
+        data_pointer = data_bank_address + 2
         for room in range(0, 0x128):
             if room in self.room_map:
                 list_idx = 0
diff --git a/Regions.py b/Regions.py
index 23dcf79b..203a564a 100644
--- a/Regions.py
+++ b/Regions.py
@@ -1179,222 +1179,224 @@ flooded_keys_reverse = {
     'Swamp Palace - Trench 1 Pot Key': 'Trench 1 Switch',
     'Swamp Palace - Trench 2 Pot Key': 'Trench 2 Switch'
 }
-location_table = {'Mushroom': (0x180013, 0x186338, False, 'in the woods'),
-                  'Bottle Merchant': (0x2eb18, 0x186339, False, 'with a merchant'),
-                  'Flute Spot': (0x18014a, 0x18633d, False, 'underground'),
-                  'Sunken Treasure': (0x180145, 0x186354, False, 'underwater'),
-                  'Purple Chest': (0x33d68, 0x186359, False, 'from a box'),
-                  "Blind's Hideout - Top": (0xeb0f, 0x1862e3, False, 'in a basement'),
-                  "Blind's Hideout - Left": (0xeb12, 0x1862e6, False, 'in a basement'),
-                  "Blind's Hideout - Right": (0xeb15, 0x1862e9, False, 'in a basement'),
-                  "Blind's Hideout - Far Left": (0xeb18, 0x1862ec, False, 'in a basement'),
-                  "Blind's Hideout - Far Right": (0xeb1b, 0x1862ef, False, 'in a basement'),
-                  "Link's Uncle": (0x2df45, 0x18635f, False, 'with your uncle'),
-                  'Secret Passage': (0xe971, 0x186145, False, 'near your uncle'),
-                  'King Zora': (0xee1c3, 0x186360, False, 'at a high price'),
-                  "Zora's Ledge": (0x180149, 0x186358, False, 'near Zora'),
-                  'Waterfall Fairy - Left': (0xe9b0, 0x186184, False, 'near a fairy'),
-                  'Waterfall Fairy - Right': (0xe9d1, 0x1861a5, False, 'near a fairy'),
-                  "King's Tomb": (0xe97a, 0x18614e, False, 'alone in a cave'),
-                  'Floodgate Chest': (0xe98c, 0x186160, False, 'in the dam'),
-                  "Link's House": (0xe9bc, 0x186190, False, 'in your home'),
-                  'Kakariko Tavern': (0xe9ce, 0x1861a2, False, 'in the bar'),
-                  'Chicken House': (0xe9e9, 0x1861bd, False, 'near poultry'),
-                  "Aginah's Cave": (0xe9f2, 0x1861c6, False, 'with Aginah'),
-                  "Sahasrahla's Hut - Left": (0xea82, 0x186256, False, 'near the elder'),
-                  "Sahasrahla's Hut - Middle": (0xea85, 0x186259, False, 'near the elder'),
-                  "Sahasrahla's Hut - Right": (0xea88, 0x18625c, False, 'near the elder'),
-                  'Sahasrahla': (0x2f1fc, 0x186365, False, 'with the elder'),
-                  'Kakariko Well - Top': (0xea8e, 0x186262, False, 'in a well'),
-                  'Kakariko Well - Left': (0xea91, 0x186265, False, 'in a well'),
-                  'Kakariko Well - Middle': (0xea94, 0x186268, False, 'in a well'),
-                  'Kakariko Well - Right': (0xea97, 0x18626b, False, 'in a well'),
-                  'Kakariko Well - Bottom': (0xea9a, 0x18626e, False, 'in a well'),
-                  'Blacksmith': (0x18002a, 0x186366, False, 'with the smith'),
-                  'Magic Bat': (0x180015, 0x18635e, False, 'with the bat'),
-                  'Sick Kid': (0x339cf, 0x186367, False, 'with the sick'),
-                  'Hobo': (0x33e7d, 0x186368, False, 'with the hobo'),
-                  'Lost Woods Hideout': (0x180000, 0x186348, False, 'near a thief'),
-                  'Lumberjack Tree': (0x180001, 0x186349, False, 'in a hole'),
-                  'Cave 45': (0x180003, 0x18634b, False, 'alone in a cave'),
-                  'Graveyard Cave': (0x180004, 0x18634c, False, 'alone in a cave'),
-                  'Checkerboard Cave': (0x180005, 0x18634d, False, 'alone in a cave'),
-                  'Mini Moldorm Cave - Far Left': (0xeb42, 0x186316, False, 'near Moldorms'),
-                  'Mini Moldorm Cave - Left': (0xeb45, 0x186319, False, 'near Moldorms'),
-                  'Mini Moldorm Cave - Right': (0xeb48, 0x18631c, False, 'near Moldorms'),
-                  'Mini Moldorm Cave - Far Right': (0xeb4b, 0x18631f, False, 'near Moldorms'),
-                  'Mini Moldorm Cave - Generous Guy': (0x180010, 0x18635a, False, 'near Moldorms'),
-                  'Ice Rod Cave': (0xeb4e, 0x186322, False, 'in a frozen cave'),
-                  'Bonk Rock Cave': (0xeb3f, 0x186313, False, 'alone in a cave'),
-                  'Library': (0x180012, 0x18635c, False, 'near books'),
-                  'Potion Shop': (0x180014, 0x18635d, False, 'near potions'),
-                  'Lake Hylia Island': (0x180144, 0x186353, False, 'on an island'),
-                  'Maze Race': (0x180142, 0x186351, False, 'at the race'),
-                  'Desert Ledge': (0x180143, 0x186352, False, 'in the desert'),
-                  'Desert Palace - Big Chest': (0xe98f, 0x186163, False, 'in Desert Palace'),
-                  'Desert Palace - Torch': (0x180160, 0x186362, False, 'in Desert Palace'),
-                  'Desert Palace - Map Chest': (0xe9b6, 0x18618a, False, 'in Desert Palace'),
-                  'Desert Palace - Compass Chest': (0xe9cb, 0x18619f, False, 'in Desert Palace'),
-                  'Desert Palace - Big Key Chest': (0xe9c2, 0x186196, False, 'in Desert Palace'),
-                  'Desert Palace - Boss': (0x180151, 0x18633f, False, 'with Lanmolas'),
-                  'Eastern Palace - Compass Chest': (0xe977, 0x18614b, False, 'in Eastern Palace'),
-                  'Eastern Palace - Big Chest': (0xe97d, 0x186151, False, 'in Eastern Palace'),
-                  'Eastern Palace - Cannonball Chest': (0xe9b3, 0x186187, False, 'in Eastern Palace'),
-                  'Eastern Palace - Big Key Chest': (0xe9b9, 0x18618d, False, 'in Eastern Palace'),
-                  'Eastern Palace - Map Chest': (0xe9f5, 0x1861c9, False, 'in Eastern Palace'),
-                  'Eastern Palace - Boss': (0x180150, 0x18633e, False, 'with the Armos'),
-                  'Master Sword Pedestal': (0x289b0, 0x186369, False, 'at the pedestal'),
-                  'Hyrule Castle - Boomerang Chest': (0xe974, 0x186148, False, 'in Hyrule Castle'),
-                  'Hyrule Castle - Map Chest': (0xeb0c, 0x1862e0, False, 'in Hyrule Castle'),
-                  "Hyrule Castle - Zelda's Chest": (0xeb09, 0x1862dd, False, 'in Hyrule Castle'),
-                  'Sewers - Dark Cross': (0xe96e, 0x186142, False, 'in the sewers'),
-                  'Sewers - Secret Room - Left': (0xeb5d, 0x186331, False, 'in the sewers'),
-                  'Sewers - Secret Room - Middle': (0xeb60, 0x186334, False, 'in the sewers'),
-                  'Sewers - Secret Room - Right': (0xeb63, 0x186337, False, 'in the sewers'),
-                  'Sanctuary': (0xea79, 0x18624d, False, 'in Sanctuary'),
-                  'Castle Tower - Room 03': (0xeab5, 0x186289, False, 'in Castle Tower'),
-                  'Castle Tower - Dark Maze': (0xeab2, 0x186286, False, 'in Castle Tower'),
-                  'Old Man': (0xf69fa, 0x186364, False, 'with the old man'),
-                  'Spectacle Rock Cave': (0x180002, 0x18634a, False, 'alone in a cave'),
-                  'Paradox Cave Lower - Far Left': (0xeb2a, 0x1862fe, False, 'in a cave with seven chests'),
-                  'Paradox Cave Lower - Left': (0xeb2d, 0x186301, False, 'in a cave with seven chests'),
-                  'Paradox Cave Lower - Right': (0xeb30, 0x186304, False, 'in a cave with seven chests'),
-                  'Paradox Cave Lower - Far Right': (0xeb33, 0x186307, False, 'in a cave with seven chests'),
-                  'Paradox Cave Lower - Middle': (0xeb36, 0x18630a, False, 'in a cave with seven chests'),
-                  'Paradox Cave Upper - Left': (0xeb39, 0x18630d, False, 'in a cave with seven chests'),
-                  'Paradox Cave Upper - Right': (0xeb3c, 0x186310, False, 'in a cave with seven chests'),
-                  'Spiral Cave': (0xe9bf, 0x186193, False, 'in Spiral Cave'),
-                  'Ether Tablet': (0x180016, 0x18633b, False, 'at a monolith'),
-                  'Spectacle Rock': (0x180140, 0x18634f, False, 'atop a rock'),
-                  'Tower of Hera - Basement Cage': (0x180162, 0x18633a, False, 'in Tower of Hera'),
-                  'Tower of Hera - Map Chest': (0xe9ad, 0x186181, False, 'in Tower of Hera'),
-                  'Tower of Hera - Big Key Chest': (0xe9e6, 0x1861ba, False, 'in Tower of Hera'),
-                  'Tower of Hera - Compass Chest': (0xe9fb, 0x1861cf, False, 'in Tower of Hera'),
-                  'Tower of Hera - Big Chest': (0xe9f8, 0x1861cc, False, 'in Tower of Hera'),
-                  'Tower of Hera - Boss': (0x180152, 0x186340, False, 'with Moldorm'),
-                  'Pyramid': (0x180147, 0x186356, False, 'on the Pyramid'),
-                  'Catfish': (0xee185, 0x186361, False, 'with a catfish'),
-                  'Stumpy': (0x330c7, 0x18636a, False, 'with tree boy'),
-                  'Digging Game': (0x180148, 0x186357, False, 'underground'),
-                  'Bombos Tablet': (0x180017, 0x18633c, False, 'at a monolith'),
-                  'Hype Cave - Top': (0xeb1e, 0x1862f2, False, 'near a bat-like man'),
-                  'Hype Cave - Middle Right': (0xeb21, 0x1862f5, False, 'near a bat-like man'),
-                  'Hype Cave - Middle Left': (0xeb24, 0x1862f8, False, 'near a bat-like man'),
-                  'Hype Cave - Bottom': (0xeb27, 0x1862fb, False, 'near a bat-like man'),
-                  'Hype Cave - Generous Guy': (0x180011, 0x18635b, False, 'with a bat-like man'),
-                  'Peg Cave': (0x180006, 0x18634e, False, 'alone in a cave'),
-                  'Pyramid Fairy - Left': (0xe980, 0x186154, False, 'near a fairy'),
-                  'Pyramid Fairy - Right': (0xe983, 0x186157, False, 'near a fairy'),
-                  'Brewery': (0xe9ec, 0x1861c0, False, 'alone in a home'),
-                  'C-Shaped House': (0xe9ef, 0x1861c3, False, 'alone in a home'),
-                  'Chest Game': (0xeda8, 0x18636b, False, 'as a prize'),
-                  'Bumper Cave Ledge': (0x180146, 0x186355, False, 'on a ledge'),
-                  'Mire Shed - Left': (0xea73, 0x186247, False, 'near sparks'),
-                  'Mire Shed - Right': (0xea76, 0x18624a, False, 'near sparks'),
-                  'Superbunny Cave - Top': (0xea7c, 0x186250, False, 'in a connection'),
-                  'Superbunny Cave - Bottom': (0xea7f, 0x186253, False, 'in a connection'),
-                  'Spike Cave': (0xea8b, 0x18625f, False, 'beyond spikes'),
-                  'Hookshot Cave - Top Right': (0xeb51, 0x186325, False, 'across pits'),
-                  'Hookshot Cave - Top Left': (0xeb54, 0x186328, False, 'across pits'),
-                  'Hookshot Cave - Bottom Right': (0xeb5a, 0x18632e, False, 'across pits'),
-                  'Hookshot Cave - Bottom Left': (0xeb57, 0x18632b, False, 'across pits'),
-                  'Floating Island': (0x180141, 0x186350, False, 'on an island'),
-                  'Mimic Cave': (0xe9c5, 0x186199, False, 'in a cave of mimicry'),
-                  'Swamp Palace - Entrance': (0xea9d, 0x186271, False, 'in Swamp Palace'),
-                  'Swamp Palace - Map Chest': (0xe986, 0x18615a, False, 'in Swamp Palace'),
-                  'Swamp Palace - Big Chest': (0xe989, 0x18615d, False, 'in Swamp Palace'),
-                  'Swamp Palace - Compass Chest': (0xeaa0, 0x186274, False, 'in Swamp Palace'),
-                  'Swamp Palace - Big Key Chest': (0xeaa6, 0x18627a, False, 'in Swamp Palace'),
-                  'Swamp Palace - West Chest': (0xeaa3, 0x186277, False, 'in Swamp Palace'),
-                  'Swamp Palace - Flooded Room - Left': (0xeaa9, 0x18627d, False, 'in Swamp Palace'),
-                  'Swamp Palace - Flooded Room - Right': (0xeaac, 0x186280, False, 'in Swamp Palace'),
-                  'Swamp Palace - Waterfall Room': (0xeaaf, 0x186283, False, 'in Swamp Palace'),
-                  'Swamp Palace - Boss': (0x180154, 0x186342, False, 'with Arrghus'),
-                  "Thieves' Town - Big Key Chest": (0xea04, 0x1861d8, False, "in Thieves Town"),
-                  "Thieves' Town - Map Chest": (0xea01, 0x1861d5, False, "in Thieves Town"),
-                  "Thieves' Town - Compass Chest": (0xea07, 0x1861db, False, "in Thieves Town"),
-                  "Thieves' Town - Ambush Chest": (0xea0a, 0x1861de, False, "in Thieves Town"),
-                  "Thieves' Town - Attic": (0xea0d, 0x1861e1, False, "in Thieves Town"),
-                  "Thieves' Town - Big Chest": (0xea10, 0x1861e4, False, "in Thieves Town"),
-                  "Thieves' Town - Blind's Cell": (0xea13, 0x1861e7, False, "in Thieves Town"),
-                  "Thieves' Town - Boss": (0x180156, 0x186344, False, 'with Blind'),
-                  'Skull Woods - Compass Chest': (0xe992, 0x186166, False, 'in Skull Woods'),
-                  'Skull Woods - Map Chest': (0xe99b, 0x18616f, False, 'in Skull Woods'),
-                  'Skull Woods - Big Chest': (0xe998, 0x18616c, False, 'in Skull Woods'),
-                  'Skull Woods - Pot Prison': (0xe9a1, 0x186175, False, 'in Skull Woods'),
-                  'Skull Woods - Pinball Room': (0xe9c8, 0x18619c, False, 'in Skull Woods'),
-                  'Skull Woods - Big Key Chest': (0xe99e, 0x186172, False, 'in Skull Woods'),
-                  'Skull Woods - Bridge Room': (0xe9fe, 0x1861d2, False, 'near Mothula'),
-                  'Skull Woods - Boss': (0x180155, 0x186343, False, 'with Mothula'),
-                  'Ice Palace - Compass Chest': (0xe9d4, 0x1861a8, False, 'in Ice Palace'),
-                  'Ice Palace - Freezor Chest': (0xe995, 0x186169, False, 'in Ice Palace'),
-                  'Ice Palace - Big Chest': (0xe9aa, 0x18617e, False, 'in Ice Palace'),
-                  'Ice Palace - Iced T Room': (0xe9e3, 0x1861b7, False, 'in Ice Palace'),
-                  'Ice Palace - Spike Room': (0xe9e0, 0x1861b4, False, 'in Ice Palace'),
-                  'Ice Palace - Big Key Chest': (0xe9a4, 0x186178, False, 'in Ice Palace'),
-                  'Ice Palace - Map Chest': (0xe9dd, 0x1861b1, False, 'in Ice Palace'),
-                  'Ice Palace - Boss': (0x180157, 0x186345, False, 'with Kholdstare'),
-                  'Misery Mire - Big Chest': (0xea67, 0x18623b, False, 'in Misery Mire'),
-                  'Misery Mire - Map Chest': (0xea6a, 0x18623e, False, 'in Misery Mire'),
-                  'Misery Mire - Main Lobby': (0xea5e, 0x186232, False, 'in Misery Mire'),
-                  'Misery Mire - Bridge Chest': (0xea61, 0x186235, False, 'in Misery Mire'),
-                  'Misery Mire - Spike Chest': (0xe9da, 0x1861ae, False, 'in Misery Mire'),
-                  'Misery Mire - Compass Chest': (0xea64, 0x186238, False, 'in Misery Mire'),
-                  'Misery Mire - Big Key Chest': (0xea6d, 0x186241, False, 'in Misery Mire'),
-                  'Misery Mire - Boss': (0x180158, 0x186346, False, 'with Vitreous'),
-                  'Turtle Rock - Compass Chest': (0xea22, 0x1861f6, False, 'in Turtle Rock'),
-                  'Turtle Rock - Roller Room - Left': (0xea1c, 0x1861f0, False, 'in Turtle Rock'),
-                  'Turtle Rock - Roller Room - Right': (0xea1f, 0x1861f3, False, 'in Turtle Rock'),
-                  'Turtle Rock - Chain Chomps': (0xea16, 0x1861ea, False, 'in Turtle Rock'),
-                  'Turtle Rock - Big Key Chest': (0xea25, 0x1861f9, False, 'in Turtle Rock'),
-                  'Turtle Rock - Big Chest': (0xea19, 0x1861ed, False, 'in Turtle Rock'),
-                  'Turtle Rock - Crystaroller Room': (0xea34, 0x186208, False, 'in Turtle Rock'),
-                  'Turtle Rock - Eye Bridge - Bottom Left': (0xea31, 0x186205, False, 'in Turtle Rock'),
-                  'Turtle Rock - Eye Bridge - Bottom Right': (0xea2e, 0x186202, False, 'in Turtle Rock'),
-                  'Turtle Rock - Eye Bridge - Top Left': (0xea2b, 0x1861ff, False, 'in Turtle Rock'),
-                  'Turtle Rock - Eye Bridge - Top Right': (0xea28, 0x1861fc, False, 'in Turtle Rock'),
-                  'Turtle Rock - Boss': (0x180159, 0x186347, False, 'with Trinexx'),
-                  'Palace of Darkness - Shooter Room': (0xea5b, 0x18622f, False, 'in Palace of Darkness'),
-                  'Palace of Darkness - The Arena - Bridge': (0xea3d, 0x186211, False, 'in Palace of Darkness'),
-                  'Palace of Darkness - Stalfos Basement': (0xea49, 0x18621d, False, 'in Palace of Darkness'),
-                  'Palace of Darkness - Big Key Chest': (0xea37, 0x18620b, False, 'in Palace of Darkness'),
-                  'Palace of Darkness - The Arena - Ledge': (0xea3a, 0x18620e, False, 'in Palace of Darkness'),
-                  'Palace of Darkness - Map Chest': (0xea52, 0x186226, False, 'in Palace of Darkness'),
-                  'Palace of Darkness - Compass Chest': (0xea43, 0x186217, False, 'in Palace of Darkness'),
-                  'Palace of Darkness - Dark Basement - Left': (0xea4c, 0x186220, False, 'in Palace of Darkness'),
-                  'Palace of Darkness - Dark Basement - Right': (0xea4f, 0x186223, False, 'in Palace of Darkness'),
-                  'Palace of Darkness - Dark Maze - Top': (0xea55, 0x186229, False, 'in Palace of Darkness'),
-                  'Palace of Darkness - Dark Maze - Bottom': (0xea58, 0x18622c, False, 'in Palace of Darkness'),
-                  'Palace of Darkness - Big Chest': (0xea40, 0x186214, False, 'in Palace of Darkness'),
-                  'Palace of Darkness - Harmless Hellway': (0xea46, 0x18621a, False, 'in Palace of Darkness'),
-                  'Palace of Darkness - Boss': (0x180153, 0x186341, False, 'with Helmasaur King'),
-                  "Ganons Tower - Bob's Torch": (0x180161, 0x186363, False, "in Ganon's Tower"),
-                  'Ganons Tower - Hope Room - Left': (0xead9, 0x1862ad, False, "in Ganon's Tower"),
-                  'Ganons Tower - Hope Room - Right': (0xeadc, 0x1862b0, False, "in Ganon's Tower"),
-                  'Ganons Tower - Tile Room': (0xeae2, 0x1862b6, False, "in Ganon's Tower"),
-                  'Ganons Tower - Compass Room - Top Left': (0xeae5, 0x1862b9, False, "in Ganon's Tower"),
-                  'Ganons Tower - Compass Room - Top Right': (0xeae8, 0x1862bc, False, "in Ganon's Tower"),
-                  'Ganons Tower - Compass Room - Bottom Left': (0xeaeb, 0x1862bf, False, "in Ganon's Tower"),
-                  'Ganons Tower - Compass Room - Bottom Right': (0xeaee, 0x1862c2, False, "in Ganon's Tower"),
-                  'Ganons Tower - DMs Room - Top Left': (0xeab8, 0x18628c, False, "in Ganon's Tower"),
-                  'Ganons Tower - DMs Room - Top Right': (0xeabb, 0x18628f, False, "in Ganon's Tower"),
-                  'Ganons Tower - DMs Room - Bottom Left': (0xeabe, 0x186292, False, "in Ganon's Tower"),
-                  'Ganons Tower - DMs Room - Bottom Right': (0xeac1, 0x186295, False, "in Ganon's Tower"),
-                  'Ganons Tower - Map Chest': (0xead3, 0x1862a7, False, "in Ganon's Tower"),
-                  'Ganons Tower - Firesnake Room': (0xead0, 0x1862a4, False, "in Ganon's Tower"),
-                  'Ganons Tower - Randomizer Room - Top Left': (0xeac4, 0x186298, False, "in Ganon's Tower"),
-                  'Ganons Tower - Randomizer Room - Top Right': (0xeac7, 0x18629b, False, "in Ganon's Tower"),
-                  'Ganons Tower - Randomizer Room - Bottom Left': (0xeaca, 0x18629e, False, "in Ganon's Tower"),
-                  'Ganons Tower - Randomizer Room - Bottom Right': (0xeacd, 0x1862a1, False, "in Ganon's Tower"),
-                  "Ganons Tower - Bob's Chest": (0xeadf, 0x1862b3, False, "in Ganon's Tower"),
-                  'Ganons Tower - Big Chest': (0xead6, 0x1862aa, False, "in Ganon's Tower"),
-                  'Ganons Tower - Big Key Room - Left': (0xeaf4, 0x1862c8, False, "in Ganon's Tower"),
-                  'Ganons Tower - Big Key Room - Right': (0xeaf7, 0x1862cb, False, "in Ganon's Tower"),
-                  'Ganons Tower - Big Key Chest': (0xeaf1, 0x1862c5, False, "in Ganon's Tower"),
-                  'Ganons Tower - Mini Helmasaur Room - Left': (0xeafd, 0x1862d1, False, "atop Ganon's Tower"),
-                  'Ganons Tower - Mini Helmasaur Room - Right': (0xeb00, 0x1862d4, False, "atop Ganon's Tower"),
-                  'Ganons Tower - Pre-Moldorm Chest': (0xeb03, 0x1862d7, False, "atop Ganon's Tower"),
-                  'Ganons Tower - Validation Chest': (0xeb06, 0x1862da, False, "atop Ganon's Tower"),
+
+lookup_id_to_name = {data[0]: name for name, data in location_table.items() if type(data[0]) == int}
+location_table = {'Mushroom': (0x180013, 0x186df8, False, 'in the woods'),
+                  'Bottle Merchant': (0x2eb18, 0x186df9, False, 'with a merchant'),
+                  'Flute Spot': (0x18014a, 0x186dfd, False, 'underground'),
+                  'Sunken Treasure': (0x180145, 0x186e14, False, 'underwater'),
+                  'Purple Chest': (0x33d68, 0x186e19, False, 'from a box'),
+                  "Blind's Hideout - Top": (0xeb0f, 0x186da3, False, 'in a basement'),
+                  "Blind's Hideout - Left": (0xeb12, 0x186da6, False, 'in a basement'),
+                  "Blind's Hideout - Right": (0xeb15, 0x186da9, False, 'in a basement'),
+                  "Blind's Hideout - Far Left": (0xeb18, 0x186dac, False, 'in a basement'),
+                  "Blind's Hideout - Far Right": (0xeb1b, 0x186daf, False, 'in a basement'),
+                  "Link's Uncle": (0x2df45, 0x186e1f, False, 'with your uncle'),
+                  'Secret Passage': (0xe971, 0x186c05, False, 'near your uncle'),
+                  'King Zora': (0xee1c3, 0x186e20, False, 'at a high price'),
+                  "Zora's Ledge": (0x180149, 0x186e18, False, 'near Zora'),
+                  'Waterfall Fairy - Left': (0xe9b0, 0x186c44, False, 'near a fairy'),
+                  'Waterfall Fairy - Right': (0xe9d1, 0x186c65, False, 'near a fairy'),
+                  "King's Tomb": (0xe97a, 0x186c0e, False, 'alone in a cave'),
+                  'Floodgate Chest': (0xe98c, 0x186c20, False, 'in the dam'),
+                  "Link's House": (0xe9bc, 0x186c50, False, 'in your home'),
+                  'Kakariko Tavern': (0xe9ce, 0x186c62, False, 'in the bar'),
+                  'Chicken House': (0xe9e9, 0x186c7d, False, 'near poultry'),
+                  "Aginah's Cave": (0xe9f2, 0x186c86, False, 'with Aginah'),
+                  "Sahasrahla's Hut - Left": (0xea82, 0x186d16, False, 'near the elder'),
+                  "Sahasrahla's Hut - Middle": (0xea85, 0x186d19, False, 'near the elder'),
+                  "Sahasrahla's Hut - Right": (0xea88, 0x186d1c, False, 'near the elder'),
+                  'Sahasrahla': (0x2f1fc, 0x186e25, False, 'with the elder'),
+                  'Kakariko Well - Top': (0xea8e, 0x186d22, False, 'in a well'),
+                  'Kakariko Well - Left': (0xea91, 0x186d25, False, 'in a well'),
+                  'Kakariko Well - Middle': (0xea94, 0x186d28, False, 'in a well'),
+                  'Kakariko Well - Right': (0xea97, 0x186d2b, False, 'in a well'),
+                  'Kakariko Well - Bottom': (0xea9a, 0x186d2e, False, 'in a well'),
+                  'Blacksmith': (0x18002a, 0x186e26, False, 'with the smith'),
+                  'Magic Bat': (0x180015, 0x186e1e, False, 'with the bat'),
+                  'Sick Kid': (0x339cf, 0x186e27, False, 'with the sick'),
+                  'Hobo': (0x33e7d, 0x186e28, False, 'with the hobo'),
+                  'Lost Woods Hideout': (0x180000, 0x186e08, False, 'near a thief'),
+                  'Lumberjack Tree': (0x180001, 0x186e09, False, 'in a hole'),
+                  'Cave 45': (0x180003, 0x186e0b, False, 'alone in a cave'),
+                  'Graveyard Cave': (0x180004, 0x186e0c, False, 'alone in a cave'),
+                  'Checkerboard Cave': (0x180005, 0x186e0d, False, 'alone in a cave'),
+                  'Mini Moldorm Cave - Far Left': (0xeb42, 0x186dd6, False, 'near Moldorms'),
+                  'Mini Moldorm Cave - Left': (0xeb45, 0x186dd9, False, 'near Moldorms'),
+                  'Mini Moldorm Cave - Right': (0xeb48, 0x186ddc, False, 'near Moldorms'),
+                  'Mini Moldorm Cave - Far Right': (0xeb4b, 0x186ddf, False, 'near Moldorms'),
+                  'Mini Moldorm Cave - Generous Guy': (0x180010, 0x186e1a, False, 'near Moldorms'),
+                  'Ice Rod Cave': (0xeb4e, 0x186de2, False, 'in a frozen cave'),
+                  'Bonk Rock Cave': (0xeb3f, 0x186dd3, False, 'alone in a cave'),
+                  'Library': (0x180012, 0x186e1c, False, 'near books'),
+                  'Potion Shop': (0x180014, 0x186e1d, False, 'near potions'),
+                  'Lake Hylia Island': (0x180144, 0x186e13, False, 'on an island'),
+                  'Maze Race': (0x180142, 0x186e11, False, 'at the race'),
+                  'Desert Ledge': (0x180143, 0x186e12, False, 'in the desert'),
+                  'Desert Palace - Big Chest': (0xe98f, 0x186c23, False, 'in Desert Palace'),
+                  'Desert Palace - Torch': (0x180160, 0x186e22, False, 'in Desert Palace'),
+                  'Desert Palace - Map Chest': (0xe9b6, 0x186c4a, False, 'in Desert Palace'),
+                  'Desert Palace - Compass Chest': (0xe9cb, 0x186c5f, False, 'in Desert Palace'),
+                  'Desert Palace - Big Key Chest': (0xe9c2, 0x186c56, False, 'in Desert Palace'),
+                  'Desert Palace - Boss': (0x180151, 0x186dff, False, 'with Lanmolas'),
+                  'Eastern Palace - Compass Chest': (0xe977, 0x186c0b, False, 'in Eastern Palace'),
+                  'Eastern Palace - Big Chest': (0xe97d, 0x186c11, False, 'in Eastern Palace'),
+                  'Eastern Palace - Cannonball Chest': (0xe9b3, 0x186c47, False, 'in Eastern Palace'),
+                  'Eastern Palace - Big Key Chest': (0xe9b9, 0x186c4d, False, 'in Eastern Palace'),
+                  'Eastern Palace - Map Chest': (0xe9f5, 0x186c89, False, 'in Eastern Palace'),
+                  'Eastern Palace - Boss': (0x180150, 0x186dfe, False, 'with the Armos'),
+                  'Master Sword Pedestal': (0x289b0, 0x186e29, False, 'at the pedestal'),
+                  'Hyrule Castle - Boomerang Chest': (0xe974, 0x186c08, False, 'in Hyrule Castle'),
+                  'Hyrule Castle - Map Chest': (0xeb0c, 0x186da0, False, 'in Hyrule Castle'),
+                  "Hyrule Castle - Zelda's Chest": (0xeb09, 0x186d9d, False, 'in Hyrule Castle'),
+                  'Sewers - Dark Cross': (0xe96e, 0x186c02, False, 'in the sewers'),
+                  'Sewers - Secret Room - Left': (0xeb5d, 0x186df1, False, 'in the sewers'),
+                  'Sewers - Secret Room - Middle': (0xeb60, 0x186df4, False, 'in the sewers'),
+                  'Sewers - Secret Room - Right': (0xeb63, 0x186df7, False, 'in the sewers'),
+                  'Sanctuary': (0xea79, 0x186d0d, False, 'in Sanctuary'),
+                  'Castle Tower - Room 03': (0xeab5, 0x186d49, False, 'in Castle Tower'),
+                  'Castle Tower - Dark Maze': (0xeab2, 0x186d46, False, 'in Castle Tower'),
+                  'Old Man': (0xf69fa, 0x186e24, False, 'with the old man'),
+                  'Spectacle Rock Cave': (0x180002, 0x186e0a, False, 'alone in a cave'),
+                  'Paradox Cave Lower - Far Left': (0xeb2a, 0x186dbe, False, 'in a cave with seven chests'),
+                  'Paradox Cave Lower - Left': (0xeb2d, 0x186dc1, False, 'in a cave with seven chests'),
+                  'Paradox Cave Lower - Right': (0xeb30, 0x186dc4, False, 'in a cave with seven chests'),
+                  'Paradox Cave Lower - Far Right': (0xeb33, 0x186dc7, False, 'in a cave with seven chests'),
+                  'Paradox Cave Lower - Middle': (0xeb36, 0x186dca, False, 'in a cave with seven chests'),
+                  'Paradox Cave Upper - Left': (0xeb39, 0x186dcd, False, 'in a cave with seven chests'),
+                  'Paradox Cave Upper - Right': (0xeb3c, 0x186dd0, False, 'in a cave with seven chests'),
+                  'Spiral Cave': (0xe9bf, 0x186c53, False, 'in Spiral Cave'),
+                  'Ether Tablet': (0x180016, 0x186dfb, False, 'at a monolith'),
+                  'Spectacle Rock': (0x180140, 0x186e0f, False, 'atop a rock'),
+                  'Tower of Hera - Basement Cage': (0x180162, 0x186dfa, False, 'in Tower of Hera'),
+                  'Tower of Hera - Map Chest': (0xe9ad, 0x186c41, False, 'in Tower of Hera'),
+                  'Tower of Hera - Big Key Chest': (0xe9e6, 0x186c7a, False, 'in Tower of Hera'),
+                  'Tower of Hera - Compass Chest': (0xe9fb, 0x186c8f, False, 'in Tower of Hera'),
+                  'Tower of Hera - Big Chest': (0xe9f8, 0x186c8c, False, 'in Tower of Hera'),
+                  'Tower of Hera - Boss': (0x180152, 0x186e00, False, 'with Moldorm'),
+                  'Pyramid': (0x180147, 0x186e16, False, 'on the Pyramid'),
+                  'Catfish': (0xee185, 0x186e21, False, 'with a catfish'),
+                  'Stumpy': (0x330c7, 0x186e2a, False, 'with tree boy'),
+                  'Digging Game': (0x180148, 0x186e17, False, 'underground'),
+                  'Bombos Tablet': (0x180017, 0x186dfc, False, 'at a monolith'),
+                  'Hype Cave - Top': (0xeb1e, 0x186db2, False, 'near a bat-like man'),
+                  'Hype Cave - Middle Right': (0xeb21, 0x186db5, False, 'near a bat-like man'),
+                  'Hype Cave - Middle Left': (0xeb24, 0x186db8, False, 'near a bat-like man'),
+                  'Hype Cave - Bottom': (0xeb27, 0x186dbb, False, 'near a bat-like man'),
+                  'Hype Cave - Generous Guy': (0x180011, 0x186e1b, False, 'with a bat-like man'),
+                  'Peg Cave': (0x180006, 0x186e0e, False, 'alone in a cave'),
+                  'Pyramid Fairy - Left': (0xe980, 0x186c14, False, 'near a fairy'),
+                  'Pyramid Fairy - Right': (0xe983, 0x186c17, False, 'near a fairy'),
+                  'Brewery': (0xe9ec, 0x186c80, False, 'alone in a home'),
+                  'C-Shaped House': (0xe9ef, 0x186c83, False, 'alone in a home'),
+                  'Chest Game': (0xeda8, 0x186e2b, False, 'as a prize'),
+                  'Bumper Cave Ledge': (0x180146, 0x186e15, False, 'on a ledge'),
+                  'Mire Shed - Left': (0xea73, 0x186d07, False, 'near sparks'),
+                  'Mire Shed - Right': (0xea76, 0x186d0a, False, 'near sparks'),
+                  'Superbunny Cave - Top': (0xea7c, 0x186d10, False, 'in a connection'),
+                  'Superbunny Cave - Bottom': (0xea7f, 0x186d13, False, 'in a connection'),
+                  'Spike Cave': (0xea8b, 0x186d1f, False, 'beyond spikes'),
+                  'Hookshot Cave - Top Right': (0xeb51, 0x186de5, False, 'across pits'),
+                  'Hookshot Cave - Top Left': (0xeb54, 0x186de8, False, 'across pits'),
+                  'Hookshot Cave - Bottom Right': (0xeb5a, 0x186dee, False, 'across pits'),
+                  'Hookshot Cave - Bottom Left': (0xeb57, 0x186deb, False, 'across pits'),
+                  'Floating Island': (0x180141, 0x186e10, False, 'on an island'),
+                  'Mimic Cave': (0xe9c5, 0x186c59, False, 'in a cave of mimicry'),
+                  'Swamp Palace - Entrance': (0xea9d, 0x186d31, False, 'in Swamp Palace'),
+                  'Swamp Palace - Map Chest': (0xe986, 0x186c1a, False, 'in Swamp Palace'),
+                  'Swamp Palace - Big Chest': (0xe989, 0x186c1d, False, 'in Swamp Palace'),
+                  'Swamp Palace - Compass Chest': (0xeaa0, 0x186d34, False, 'in Swamp Palace'),
+                  'Swamp Palace - Big Key Chest': (0xeaa6, 0x186d3a, False, 'in Swamp Palace'),
+                  'Swamp Palace - West Chest': (0xeaa3, 0x186d37, False, 'in Swamp Palace'),
+                  'Swamp Palace - Flooded Room - Left': (0xeaa9, 0x186d3d, False, 'in Swamp Palace'),
+                  'Swamp Palace - Flooded Room - Right': (0xeaac, 0x186d40, False, 'in Swamp Palace'),
+                  'Swamp Palace - Waterfall Room': (0xeaaf, 0x186d43, False, 'in Swamp Palace'),
+                  'Swamp Palace - Boss': (0x180154, 0x186e02, False, 'with Arrghus'),
+                  "Thieves' Town - Big Key Chest": (0xea04, 0x186c98, False, "in Thieves Town"),
+                  "Thieves' Town - Map Chest": (0xea01, 0x186c95, False, "in Thieves Town"),
+                  "Thieves' Town - Compass Chest": (0xea07, 0x186c9b, False, "in Thieves Town"),
+                  "Thieves' Town - Ambush Chest": (0xea0a, 0x186c9e, False, "in Thieves Town"),
+                  "Thieves' Town - Attic": (0xea0d, 0x186ca1, False, "in Thieves Town"),
+                  "Thieves' Town - Big Chest": (0xea10, 0x186ca4, False, "in Thieves Town"),
+                  "Thieves' Town - Blind's Cell": (0xea13, 0x186ca7, False, "in Thieves Town"),
+                  "Thieves' Town - Boss": (0x180156, 0x186e04, False, 'with Blind'),
+                  'Skull Woods - Compass Chest': (0xe992, 0x186c26, False, 'in Skull Woods'),
+                  'Skull Woods - Map Chest': (0xe99b, 0x186c2f, False, 'in Skull Woods'),
+                  'Skull Woods - Big Chest': (0xe998, 0x186c2c, False, 'in Skull Woods'),
+                  'Skull Woods - Pot Prison': (0xe9a1, 0x186c35, False, 'in Skull Woods'),
+                  'Skull Woods - Pinball Room': (0xe9c8, 0x186c5c, False, 'in Skull Woods'),
+                  'Skull Woods - Big Key Chest': (0xe99e, 0x186c32, False, 'in Skull Woods'),
+                  'Skull Woods - Bridge Room': (0xe9fe, 0x186c92, False, 'near Mothula'),
+                  'Skull Woods - Boss': (0x180155, 0x186e03, False, 'with Mothula'),
+                  'Ice Palace - Compass Chest': (0xe9d4, 0x186c68, False, 'in Ice Palace'),
+                  'Ice Palace - Freezor Chest': (0xe995, 0x186c29, False, 'in Ice Palace'),
+                  'Ice Palace - Big Chest': (0xe9aa, 0x186c3e, False, 'in Ice Palace'),
+                  'Ice Palace - Iced T Room': (0xe9e3, 0x186c77, False, 'in Ice Palace'),
+                  'Ice Palace - Spike Room': (0xe9e0, 0x186c74, False, 'in Ice Palace'),
+                  'Ice Palace - Big Key Chest': (0xe9a4, 0x186c38, False, 'in Ice Palace'),
+                  'Ice Palace - Map Chest': (0xe9dd, 0x186c71, False, 'in Ice Palace'),
+                  'Ice Palace - Boss': (0x180157, 0x186e05, False, 'with Kholdstare'),
+                  'Misery Mire - Big Chest': (0xea67, 0x186cfb, False, 'in Misery Mire'),
+                  'Misery Mire - Map Chest': (0xea6a, 0x186cfe, False, 'in Misery Mire'),
+                  'Misery Mire - Main Lobby': (0xea5e, 0x186cf2, False, 'in Misery Mire'),
+                  'Misery Mire - Bridge Chest': (0xea61, 0x186cf5, False, 'in Misery Mire'),
+                  'Misery Mire - Spike Chest': (0xe9da, 0x186c6e, False, 'in Misery Mire'),
+                  'Misery Mire - Compass Chest': (0xea64, 0x186cf8, False, 'in Misery Mire'),
+                  'Misery Mire - Big Key Chest': (0xea6d, 0x186d01, False, 'in Misery Mire'),
+                  'Misery Mire - Boss': (0x180158, 0x186e06, False, 'with Vitreous'),
+                  'Turtle Rock - Compass Chest': (0xea22, 0x186cb6, False, 'in Turtle Rock'),
+                  'Turtle Rock - Roller Room - Left': (0xea1c, 0x186cb0, False, 'in Turtle Rock'),
+                  'Turtle Rock - Roller Room - Right': (0xea1f, 0x186cb3, False, 'in Turtle Rock'),
+                  'Turtle Rock - Chain Chomps': (0xea16, 0x186caa, False, 'in Turtle Rock'),
+                  'Turtle Rock - Big Key Chest': (0xea25, 0x186cb9, False, 'in Turtle Rock'),
+                  'Turtle Rock - Big Chest': (0xea19, 0x186cad, False, 'in Turtle Rock'),
+                  'Turtle Rock - Crystaroller Room': (0xea34, 0x186cc8, False, 'in Turtle Rock'),
+                  'Turtle Rock - Eye Bridge - Bottom Left': (0xea31, 0x186cc5, False, 'in Turtle Rock'),
+                  'Turtle Rock - Eye Bridge - Bottom Right': (0xea2e, 0x186cc2, False, 'in Turtle Rock'),
+                  'Turtle Rock - Eye Bridge - Top Left': (0xea2b, 0x186cbf, False, 'in Turtle Rock'),
+                  'Turtle Rock - Eye Bridge - Top Right': (0xea28, 0x186cbc, False, 'in Turtle Rock'),
+                  'Turtle Rock - Boss': (0x180159, 0x186e07, False, 'with Trinexx'),
+                  'Palace of Darkness - Shooter Room': (0xea5b, 0x186cef, False, 'in Palace of Darkness'),
+                  'Palace of Darkness - The Arena - Bridge': (0xea3d, 0x186cd1, False, 'in Palace of Darkness'),
+                  'Palace of Darkness - Stalfos Basement': (0xea49, 0x186cdd, False, 'in Palace of Darkness'),
+                  'Palace of Darkness - Big Key Chest': (0xea37, 0x186ccb, False, 'in Palace of Darkness'),
+                  'Palace of Darkness - The Arena - Ledge': (0xea3a, 0x186cce, False, 'in Palace of Darkness'),
+                  'Palace of Darkness - Map Chest': (0xea52, 0x186ce6, False, 'in Palace of Darkness'),
+                  'Palace of Darkness - Compass Chest': (0xea43, 0x186cd7, False, 'in Palace of Darkness'),
+                  'Palace of Darkness - Dark Basement - Left': (0xea4c, 0x186ce0, False, 'in Palace of Darkness'),
+                  'Palace of Darkness - Dark Basement - Right': (0xea4f, 0x186ce3, False, 'in Palace of Darkness'),
+                  'Palace of Darkness - Dark Maze - Top': (0xea55, 0x186ce9, False, 'in Palace of Darkness'),
+                  'Palace of Darkness - Dark Maze - Bottom': (0xea58, 0x186cec, False, 'in Palace of Darkness'),
+                  'Palace of Darkness - Big Chest': (0xea40, 0x186cd4, False, 'in Palace of Darkness'),
+                  'Palace of Darkness - Harmless Hellway': (0xea46, 0x186cda, False, 'in Palace of Darkness'),
+                  'Palace of Darkness - Boss': (0x180153, 0x186e01, False, 'with Helmasaur King'),
+                  "Ganons Tower - Bob's Torch": (0x180161, 0x186e23, False, "in Ganon's Tower"),
+                  'Ganons Tower - Hope Room - Left': (0xead9, 0x186d6d, False, "in Ganon's Tower"),
+                  'Ganons Tower - Hope Room - Right': (0xeadc, 0x186d70, False, "in Ganon's Tower"),
+                  'Ganons Tower - Tile Room': (0xeae2, 0x186d76, False, "in Ganon's Tower"),
+                  'Ganons Tower - Compass Room - Top Left': (0xeae5, 0x186d79, False, "in Ganon's Tower"),
+                  'Ganons Tower - Compass Room - Top Right': (0xeae8, 0x186d7c, False, "in Ganon's Tower"),
+                  'Ganons Tower - Compass Room - Bottom Left': (0xeaeb, 0x186d7f, False, "in Ganon's Tower"),
+                  'Ganons Tower - Compass Room - Bottom Right': (0xeaee, 0x186d82, False, "in Ganon's Tower"),
+                  'Ganons Tower - DMs Room - Top Left': (0xeab8, 0x186d4c, False, "in Ganon's Tower"),
+                  'Ganons Tower - DMs Room - Top Right': (0xeabb, 0x186d4f, False, "in Ganon's Tower"),
+                  'Ganons Tower - DMs Room - Bottom Left': (0xeabe, 0x186d52, False, "in Ganon's Tower"),
+                  'Ganons Tower - DMs Room - Bottom Right': (0xeac1, 0x186d55, False, "in Ganon's Tower"),
+                  'Ganons Tower - Map Chest': (0xead3, 0x186d67, False, "in Ganon's Tower"),
+                  'Ganons Tower - Firesnake Room': (0xead0, 0x186d64, False, "in Ganon's Tower"),
+                  'Ganons Tower - Randomizer Room - Top Left': (0xeac4, 0x186d58, False, "in Ganon's Tower"),
+                  'Ganons Tower - Randomizer Room - Top Right': (0xeac7, 0x186d5b, False, "in Ganon's Tower"),
+                  'Ganons Tower - Randomizer Room - Bottom Left': (0xeaca, 0x186d5e, False, "in Ganon's Tower"),
+                  'Ganons Tower - Randomizer Room - Bottom Right': (0xeacd, 0x186d61, False, "in Ganon's Tower"),
+                  "Ganons Tower - Bob's Chest": (0xeadf, 0x186d73, False, "in Ganon's Tower"),
+                  'Ganons Tower - Big Chest': (0xead6, 0x186d6a, False, "in Ganon's Tower"),
+                  'Ganons Tower - Big Key Room - Left': (0xeaf4, 0x186d88, False, "in Ganon's Tower"),
+                  'Ganons Tower - Big Key Room - Right': (0xeaf7, 0x186d8b, False, "in Ganon's Tower"),
+                  'Ganons Tower - Big Key Chest': (0xeaf1, 0x186d85, False, "in Ganon's Tower"),
+                  'Ganons Tower - Mini Helmasaur Room - Left': (0xeafd, 0x186d91, False, "atop Ganon's Tower"),
+                  'Ganons Tower - Mini Helmasaur Room - Right': (0xeb00, 0x186d94, False, "atop Ganon's Tower"),
+                  'Ganons Tower - Pre-Moldorm Chest': (0xeb03, 0x186d97, False, "atop Ganon's Tower"),
+                  'Ganons Tower - Validation Chest': (0xeb06, 0x186d9a, False, "atop Ganon's Tower"),
                   'Ganon': (None, None, False, 'from me'),
                   'Agahnim 1': (None, None, False, 'from Ganon\'s wizardry form'),
                   'Agahnim 2': (None, None, False, 'from Ganon\'s wizardry form'),
@@ -1455,8 +1457,6 @@ location_table = {'Mushroom': (0x180013, 0x186338, False, 'in the woods'),
                   'Potion Shop - Middle': (None, None, False, 'for sale near potions'),
                   'Potion Shop - Right': (None, None, False, 'for sale near potions'),
                   }
-
-lookup_id_to_name = {data[0]: name for name, data in location_table.items() if type(data[0]) == int}
 lookup_id_to_name.update(shop_table_by_location_id)
 lookup_name_to_id = {name: data[0] for name, data in location_table.items() if type(data[0]) == int}
 lookup_name_to_id.update(shop_table_by_location)
diff --git a/Rom.py b/Rom.py
index 18677375..26b54dbf 100644
--- a/Rom.py
+++ b/Rom.py
@@ -1548,16 +1548,18 @@ def patch_rom(world, rom, player, team, enemized, is_mystery=False):
         colorize_pots = is_mystery or (world.pottery[player] not in ['vanilla', 'lottery']
                                        and (world.colorizepots[player]
                                             or world.pottery[player] in ['reduced', 'clustered']))
-        if world.pot_contents[player].size() > 0x2800:
+        if world.pot_contents[player].size() > 0x11c0:
             raise Exception('Pot table is too big for current area')
         world.pot_contents[player].write_pot_data_to_rom(rom, colorize_pots)
 
+    # todo: write sprites
+
     write_strings(rom, world, player, team)
 
     # write initial sram
     rom.write_initial_sram()
 
-    rom.write_byte(0x18636C, 1 if world.remote_items[player] else 0)
+    rom.write_byte(0x187E30, 1 if world.remote_items[player] else 0)
 
     # set rom name
     # 21 bytes
@@ -1615,7 +1617,7 @@ def write_custom_shops(rom, world, player):
             if item is None:
                 break
             if world.shopsanity[player] or shop.type == ShopType.TakeAny:
-                rom.write_byte(0x186560 + shop.sram_address + index, 1)
+                rom.write_byte(0x187E40 + shop.sram_address + index, 1)
             if world.shopsanity[player] and shop.region.name in shop_to_location_table:
                 loc_item = world.get_location(shop_to_location_table[shop.region.name][index], player).item
             elif world.shopsanity[player] and shop.region.name in retro_shops:
diff --git a/Utils.py b/Utils.py
index d0bbb5fc..a4e3cee2 100644
--- a/Utils.py
+++ b/Utils.py
@@ -6,6 +6,7 @@ import sys
 import xml.etree.ElementTree as ET
 from collections import defaultdict
 from math import factorial
+import fileinput
 
 
 def int16_as_bytes(value):
@@ -696,10 +697,19 @@ def check_pots():
                     print(f'{pot.room}#{i+1} secret: {hex(secret_vram)} tile: {hex(tile_vram)}')
 
 
+def find_and_replace():
+    for data_line in fileinput.input('scratch.txt', inplace=True):
+        if '=' in data_line:
+            one, two = data_line.split(' = ')
+            number = int(two.strip())
+            print(data_line.replace(two, hex(number)))
+
+
 if __name__ == '__main__':
     # make_new_base2current()
     # read_entrance_data(old_rom=sys.argv[1])
     # room_palette_data(old_rom=sys.argv[1])
     # extract_data_from_us_rom(sys.argv[1])
     # extract_data_from_jp_rom(sys.argv[1])
-    check_pots()
+    # check_pots()
+    find_and_replace()
diff --git a/source/dungeon/EnemyList.py b/source/dungeon/EnemyList.py
index cd5bb518..37e5e627 100644
--- a/source/dungeon/EnemyList.py
+++ b/source/dungeon/EnemyList.py
@@ -1,3 +1,4 @@
+from collections import defaultdict
 import math
 import typing
 
@@ -6,11 +7,17 @@ try:
 except ImportError:
     from enum import IntFlag as FastEnum
 
+import RaceRandom as random
+from BaseClasses import Location, LocationType
+from Items import ItemFactory
+from Utils import snes_to_pc, pc_to_snes, int16_as_bytes
 from source.logic.Rule import RuleFactory
 
+# todo: bosses shifted coordinates
+
 
 class EnemyStats:
-    def __init__(self, sprite, static, drop_flag=False, prize_pack=0, sub_type=0):
+    def __init__(self, sprite, static, drop_flag=False, prize_pack: typing.Union[tuple, int] = 0, sub_type=0):
         self.sprite = sprite
         self.sub_type = sub_type
         self.static = static
@@ -21,11 +28,16 @@ class EnemyStats:
 
 
 class EnemySprite(FastEnum):
-    CorrectPullSwitch = 0x04,
+    Raven = 0x00
+    Vulture = 0x01
+    CorrectPullSwitch = 0x04
     WrongPullSwitch = 0x06
     Octorok = 0x08
     Moldorm = 0x09
+    Octorok4Way = 0x0a
     Cucco = 0x0b
+    Buzzblob = 0x0d
+    Snapdragon = 0x0e
 
     Octoballoon = 0x0f
     OctoballoonBaby = 0x10
@@ -90,16 +102,20 @@ class EnemySprite(FastEnum):
     BombGuard = 0x4a
     GreenKnifeGuard = 0x4b
     Geldman = 0x4c
+    Toppo = 0x4d
     Popo = 0x4e
     Popo2 = 0x4f
-    
+
+    ArmosStatue = 0x51
+    KingZora = 0x52
     ArmosKnight = 0x53
     Lanmolas = 0x54
+    FireballZora = 0x55
     Zora = 0x56
     DesertStatue = 0x57
     Crab = 0x58
     LostWoodsBird = 0x59
-    LostWoodsSquirrel =0x5a
+    LostWoodsSquirrel = 0x5a
     SparkCW = 0x5b
     SparkCCW = 0x5c
     RollerVerticalUp = 0x5d
@@ -159,8 +175,8 @@ class EnemySprite(FastEnum):
     Pengator = 0x99
     Kyameron = 0x9a
     Wizzrobe = 0x9b
-    Zoro = 0x9c
-    Babasu = 0x9d
+    Zoro = 0x9c  # babasu horizontal?
+    Babasu = 0x9d  # babasu vertical?
     GroveOstritch = 0x9e
     GroveRabbit = 0x9f
     GroveBird = 0xa0    
@@ -171,6 +187,10 @@ class EnemySprite(FastEnum):
     BlueZazak = 0xa5
     RedZazak = 0xa6
     Stalfos = 0xa7
+    GreenZirro = 0xa8
+    BlueZirro = 0xa9
+    Pikit = 0xaa
+    CrystalMaiden = 0xab
     # ... OW
     OldMan = 0xad
     PipeDown = 0xae
@@ -179,9 +199,12 @@ class EnemySprite(FastEnum):
     PipeLeft = 0xb1
     GoodBee = 0xb2
     PedestalPlaque = 0xb3
+    PurpleChest = 0xb4
     BombShopGuy = 0xb5
+    Kiki = 0xb6
     BlindMaiden = 0xb7
-    
+    BullyPinkBall = 0xb9
+
     Whirlpool = 0xba
     Shopkeeper = 0xbb
     Drunkard = 0xbc
@@ -206,14 +229,18 @@ class EnemySprite(FastEnum):
     Lynel = 0xd0
     BunnyBeam = 0xd1
     FloppingFish = 0xd2
-    Stal = 0xd3
+    Stal = 0xd3  # alive skull rock?
+    DiggingGameNPC = 0xd5
     Ganon = 0xd6
 
     Faerie = 0xe3
     SmallKey = 0xe4
+    FakeMasterSword = 0xe8
     MagicShopAssistant = 0xe9
     HeartPiece = 0xeb
+    SomariaPlatform = 0xed
     CastleMantle = 0xee
+    MedallionTablet = 0xf2
     
     
 class SpriteType(FastEnum):
@@ -222,7 +249,7 @@ class SpriteType(FastEnum):
 
 
 def init_enemy_stats():
-    enemy_stats = {
+    stats = {
         EnemySprite.CorrectPullSwitch: EnemyStats(EnemySprite.CorrectPullSwitch, True),
         EnemySprite.WrongPullSwitch: EnemyStats(EnemySprite.WrongPullSwitch, True),
         EnemySprite.Octorok: EnemyStats(EnemySprite.Octorok, False, True, 2),
@@ -417,6 +444,22 @@ def init_enemy_stats():
         EnemySprite.CastleMantle: EnemyStats(EnemySprite.CastleMantle, True),
 
     }
+    return stats
+
+
+def handle_native_dungeon(location, itemid):
+    # Keys in their native dungeon should use the original item code for keys
+    if location.parent_region.dungeon:
+        if location.parent_region.dungeon.name == location.item.dungeon:
+            if location.item.bigkey:
+                return 0x32
+            if location.item.smallkey:
+                return 0x24
+            if location.item.map:
+                return 0x33
+            if location.item.compass:
+                return 0x25
+    return itemid
 
 
 class Sprite(object):
@@ -432,15 +475,36 @@ class Sprite(object):
         self.drops_item = drops_item
         self.drop_item_kind = drop_item_kind
 
+        self.location = None
+
+    def copy(self):
+        return Sprite(self.super_tile, self.kind, self.sub_type, self.layer, self.tile_x, self.tile_y, self.region,
+                      self.drops_item, self.drop_item_kind)
+
+    def sprite_data(self):
+        data = [(self.layer << 7) | ((self.sub_type & 0x18) << 2) | self.tile_y,
+                ((self.sub_type & 7) << 5) | self.tile_x, self.kind]
+        if self.location is not None:
+            item_id = self.location.item.code if self.location.item is not None else 0x5A
+            code = 0xF9 if self.location.item.player != self.location.player else 0xF8
+            if code == 0xF8:
+                item_id = handle_native_dungeon(self.location, item_id)
+            data.append(item_id)
+            data.append(0 if code == 0xF8 else self.location.item.player)
+            data.append(code)
+        return data
+
 
 # map of super_tile to list of Sprite objects:
 vanilla_sprites = {}
+enemy_stats = {}
 
 
-def create_sprite(super_tile, kind, sub_type, layer, tile_x, tile_y, region=None, drops_item=False, drop_item_kind=None):
+def create_sprite(super_tile, kind, sub_type, layer, tile_x, tile_y, region=None,
+                  drops_item=False, drop_item_kind=None):
     if super_tile not in vanilla_sprites:
         vanilla_sprites[super_tile] = []
-    vanilla_sprites[super_tile].append(Sprite(kind, sub_type, layer, tile_x, tile_y,
+    vanilla_sprites[super_tile].append(Sprite(super_tile, kind, sub_type, layer, tile_x, tile_y,
                                               region, drops_item, drop_item_kind))
 
 
@@ -672,22 +736,22 @@ def init_vanilla_sprites():
     create_sprite(0x0027, EnemySprite.SparkCW, 0x00, 0, 0x0f, 0x06, 'Hera Big Chest Landing')
     create_sprite(0x0027, EnemySprite.Kondongo, 0x00, 0, 0x05, 0x0e, 'Hera 4F')
     create_sprite(0x0027, EnemySprite.Kondongo, 0x00, 0, 0x04, 0x16, 'Hera 4F')
-    create_sprite(0x0028, EnemySprite.Kyameron, 0x00, 0, 0x0a, 0x06, 'Hera 4F')
+    create_sprite(0x0028, EnemySprite.Kyameron, 0x00, 0, 0x0a, 0x06, 'Swamp Entrance')
     create_sprite(0x0028, EnemySprite.Hover, 0x00, 0, 0x08, 0x08, 'Swamp Entrance')
     create_sprite(0x0028, EnemySprite.Hover, 0x00, 0, 0x0b, 0x0a, 'Swamp Entrance')
     create_sprite(0x0028, EnemySprite.Hover, 0x00, 0, 0x07, 0x0d, 'Swamp Entrance')
     create_sprite(0x0028, EnemySprite.SpikeBlock, 0x00, 0, 0x08, 0x10, 'Swamp Entrance')
     create_sprite(0x0029, EnemySprite.Mothula, 0x00, 0, 0x18, 0x16)
     create_sprite(0x0029, 0x07, SpriteType.Overlord, 0, 0x07, 0x16)
-    create_sprite(0x002a, EnemySprite.CrystalSwitch, 0x00, 0, 0x10, 0x17)
-    create_sprite(0x002a, EnemySprite.Bumper, 0x00, 0, 0x0f, 0x0f)
+    create_sprite(0x002a, EnemySprite.CrystalSwitch, 0x00, 0, 0x10, 0x17, 'PoD Arena Main')
+    create_sprite(0x002a, EnemySprite.Bumper, 0x00, 0, 0x0f, 0x0f, 'PoD Arena Main')
     create_sprite(0x002a, EnemySprite.HardhatBeetle, 0x00, 0, 0x0d, 0x08, 'PoD Arena North')
     create_sprite(0x002a, EnemySprite.HardhatBeetle, 0x00, 0, 0x07, 0x0c, 'PoD Arena Main')
     create_sprite(0x002a, EnemySprite.HardhatBeetle, 0x00, 0, 0x10, 0x0c, 'PoD Arena Main')
     create_sprite(0x002a, EnemySprite.HardhatBeetle, 0x00, 0, 0x0d, 0x0f, 'PoD Arena Main')
     create_sprite(0x002a, EnemySprite.HardhatBeetle, 0x00, 0, 0x13, 0x11, 'PoD Arena Main')
     create_sprite(0x002a, EnemySprite.HardhatBeetle, 0x00, 0, 0x0f, 0x13, 'PoD Arena Main')
-    create_sprite(0x002b, EnemySprite.CrystalSwitch, 0x00, 0, 0x0a, 0x11, 'PoD Arena Main')
+    create_sprite(0x002b, EnemySprite.CrystalSwitch, 0x00, 0, 0x0a, 0x11)
     create_sprite(0x002b, EnemySprite.Statue, 0x00, 0, 0x0a, 0x0a)
     create_sprite(0x002b, EnemySprite.RedBari, 0x00, 0, 0x07, 0x17, 'PoD Map Balcony')
     create_sprite(0x002b, EnemySprite.Faerie, 0x00, 0, 0x16, 0x17)
@@ -776,9 +840,9 @@ def init_vanilla_sprites():
     create_sprite(0x0039, 0x09, SpriteType.Overlord, 0, 0x0f, 0x0f)
     create_sprite(0x0039, EnemySprite.Gibdo, 0x00, 0, 0x05, 0x15, 'Skull Spike Corner', True, 0xe4)
     create_sprite(0x0039, EnemySprite.MiniHelmasaur, 0x00, 0, 0x09, 0x15, 'Skull Spike Corner')
-    create_sprite(0x0039, EnemySprite.SpikeBlock, 0x00, 0, 0x17, 0x16, 'Skull Spike Corner')
+    create_sprite(0x0039, EnemySprite.SpikeBlock, 0x00, 0, 0x17, 0x16, 'Skull Final Drop')
     create_sprite(0x0039, EnemySprite.HardhatBeetle, 0x00, 0, 0x0b, 0x18, 'Skull Spike Corner')
-    create_sprite(0x0039, EnemySprite.SpikeBlock, 0x00, 0, 0x17, 0x1a, 'Skull Spike Corner')
+    create_sprite(0x0039, EnemySprite.SpikeBlock, 0x00, 0, 0x17, 0x1a, 'Skull Final Drop')
     create_sprite(0x003a, EnemySprite.Terrorpin, 0x00, 0, 0x0e, 0x11, 'PoD Pit Room',)
     create_sprite(0x003a, EnemySprite.Terrorpin, 0x00, 0, 0x11, 0x11, 'PoD Pit Room',)
     create_sprite(0x003a, EnemySprite.Medusa, 0x00, 0, 0x04, 0x14, 'PoD Pit Room',)
@@ -1920,6 +1984,8 @@ def init_vanilla_sprites():
     create_sprite(0x0126, EnemySprite.Faerie, 0x00, 0, 0x08, 0x16)
     create_sprite(0x0126, EnemySprite.HeartPiece, 0x00, 0, 0x1c, 0x14)
     create_sprite(0x0127, EnemySprite.HeartPiece, 0x00, 0, 0x07, 0x16)
+    global enemy_stats
+    enemy_stats = init_enemy_stats()
 
 
 def kill_rules(world, player, stats):
@@ -1984,6 +2050,132 @@ def kill_rules(world, player, stats):
     return defeat_rules
 
 
+layered_oam_rooms = {
+    0x14, 0x15, 0x51, 0x59, 0x5b, 0x60, 0x62, 0x81, 0x86, 0xa8, 0xaa, 0xb2, 0xb9, 0xc2, 0xcb, 0xcc, 0xdb, 0xdc
+}
+
+
+class EnemyTable:
+    def __init__(self):
+        self.room_map = defaultdict(list)
+        self.multiworld_count = 0
+
+    def write_sprite_data_to_rom(self, rom):
+        pointer_address = snes_to_pc(0x09D62E)
+        data_pointer = snes_to_pc(0x288000)
+        empty_pointer = pc_to_snes(data_pointer) & 0xFFFF
+        rom.write_bytes(data_pointer, [0x00, 0xff])
+        data_pointer += 2
+        for room in range(0, 0x128):
+            if room in self.room_map:
+                data_address = pc_to_snes(data_pointer) & 0xFFFF
+                rom.write_bytes(pointer_address + room * 2, int16_as_bytes(data_address))
+                rom.write_byte(data_pointer, 0x01 if room in layered_oam_rooms else 0x00)
+                list_offset = 1
+                for sprite in self.room_map[room]:
+                    data = sprite.sprite_data()
+                    rom.write_bytes(data_pointer + list_offset, data)
+                    list_offset + len(data)
+                rom.write_byte(data_pointer, 0xff)
+                data_pointer += list_offset + 1
+            else:
+                rom.write_bytes(pointer_address + room * 2, int16_as_bytes(empty_pointer))
+
+    def size(self):
+        size = 2
+        for room in range(0, 0x128):
+            if room in self.room_map:
+                size += sum(len(sprite.sprite_data()) for sprite in self.room_map[room]) + 2
+        return size
+
+
+def setup_enemy_locations(world, player):
+    world.enemy_list[player] = EnemyTable()
+    for super_tile, enemy_list in vanilla_sprites.items():
+        for index, sprite in enumerate(enemy_list):
+            # if sprite.drops_item and sprite.drop_item_kind == 0xe4:
+            #     # normal key drops
+            #     pass
+            my_sprite = sprite.copy()
+            world.enemy_list[player].room_map[super_tile].append()
+
+            if valid_drop_location(my_sprite, world, player):
+                create_drop_location(my_sprite, index, super_tile, world, player)
+
+
+def valid_drop_location(sprite, world, player):
+    if world.dropshuffle[player] == 'underworld':
+        if sprite.drops_item and sprite.drop_item_kind == 0xe4:
+            # already has a location -- hook it up?
+            return False
+        else:
+            stat = enemy_stats[sprite.kind]
+            return not stat.static and stat.drop_flag
+
+
+def create_drop_location(sprite, index, super_tile, world, player):
+
+    address = drop_address(index, super_tile)
+    region_name = sprite.region
+    parent = world.get_region(region_name, player)
+    descriptor = f'Enemy #{index+1}'
+    modifier = parent.hint_text not in {'a storyteller', 'fairies deep in a cave', 'a spiky hint',
+                                        'a bounty of five items', 'the sick kid', 'Sahasrahla'}
+    hint_text = f'{"held by an enemy"} {"in" if modifier else "near"} {parent.hint_text}'
+    drop_location = Location(player, f'{region_name} {descriptor}', address, hint_text=hint_text, parent=parent)
+    world.dynamic_locations.append(drop_location)
+    drop_location.drop = sprite
+    sprite.location = drop_location
+    drop_location.type = LocationType.Drop
+
+
+# todo: placeholder address
+def drop_address(index, super_tile):
+    return 0x7f9000 + super_tile * 2 + (index << 24)
+
+
+prize_pack_selector = {
+    0: ['Nothing'],
+    1: ['Small Heart', 'Small Heart', 'Small Heart', 'Small Heart',
+        'Rupee (1)', 'Small Heart', 'Small Heart', 'Rupee (1)'],
+    2: ['Rupees (5)', 'Rupee (1)', 'Rupees (5)', 'Rupees (20)',
+        'Rupees (5)', 'Rupee (1)', 'Rupees (5)', 'Rupees (5)'],
+    3: ['Big Magic', 'Small Magic', 'Small Magic', 'Rupees (5)',
+        'Big Magic', 'Small Magic', 'Small Heart', 'Small Magic'],
+    4: ['Single Bomb', 'Single Bomb', 'Single Bomb', 'Single Bomb',
+        'Single Bomb', 'Single Bomb', 'Bombs (10)', 'Single Bomb'],
+    5: ['Arrows (5)', 'Small Heart', 'Arrows (5)', 'Arrows (10)',
+        'Arrows (5)', 'Small Heart', 'Arrows (5)', 'Arrows (10)'],
+    6: ['Small Magic', 'Rupee (1)', 'Small Heart', 'Arrows (5)',
+        'Small Magic', 'Single Bomb', 'Rupee (1)', 'Small Heart'],
+    7: ['Small Heart', 'Fairy', 'Big Magic', 'Rupees (20)',
+        'Bombs (10)', 'Small Heart', 'Rupees (20)', 'Arrows (10)'],
+}
+
+
+def add_drop_contents(world, player):
+    retro_bow = world.bow_mode[player].startswith('retro')
+    index_selector = [0]*8
+    for super_tile, enemy_list in world.enemy_list[player].room_map.items():
+        for sprite in enemy_list:
+            if sprite.drops_item and sprite.drop_item_kind == 0xe4:
+                continue
+            else:
+                stat = enemy_stats[sprite.kind]
+                if not stat.static and stat.drop_flag:
+                    pack = 0
+                    if isinstance(stat.prize_pack, int):
+                        pack = stat.prize_pack
+                    elif isinstance(stat.prize_pack, tuple):
+                        pack = random.choice(stat.prize_pack)
+                    pack_contents = prize_pack_selector[pack]
+                    idx = index_selector[pack]
+                    index_selector[pack] = (idx + 1) % len(pack_contents)
+                    item_name = pack_contents[idx]
+                    item_name = 'Rupees (5)' if retro_bow and 'Arrows' in item_name else item_name
+                    world.itempool.append(ItemFactory(item_name, player))
+
+
 def or_rule(*rules):
     return RuleFactory.disj(rules)
 
@@ -2126,3 +2318,218 @@ def can_shoot_arrows(world, player):
 def can_use_bombs(world, player):
     return or_rule(RuleFactory.static_rule(not world.bombag[player]), has('Bomb Upgrade (+10)', player))
 
+enemy_names = {
+    0x00: 'Raven',
+    0x01: 'Vulture',
+    0x04: 'CorrectPullSwitch',
+    0x06: 'WrongPullSwitch',
+    0x08: 'Octorok',
+    0x09: 'Moldorm',
+    0x0a: 'Octorok4Way',
+    0x0b: 'Cucco',
+    0x0d: 'Buzzblob',
+    0x0e: 'Snapdragon',
+
+    0x0f: 'Octoballoon',
+    0x10: 'OctoballoonBaby',
+    0x11: 'Hinox',
+    0x12: 'Moblin',
+    0x13: 'MiniHelmasaur',
+    0x14: 'ThievesTownGrate',
+    0x15: 'AntiFairy',
+    0x16: 'Wiseman',
+    0x17: 'Hoarder',
+    0x18: 'MiniMoldorm',
+    0x19: 'Poe',
+    0x1a: 'Smithy',
+    0x1b: 'Arrow',
+    0x1c: 'Statue',
+    0x1d: 'FluteQuest',
+    0x1e: 'CrystalSwitch',
+    0x1f: 'SickKid',
+    0x20: 'Sluggula',
+    0x21: 'WaterSwitch',
+    0x22: 'Ropa',
+    0x23: 'RedBari',
+    0x24: 'BlueBari',
+    0x25: 'TalkingTree',
+    0x26: 'HardhatBeetle',
+    0x27: 'Deadrock',
+    0x28: 'DarkWorldHintNpc',
+    0x29: 'AdultNpc',
+    0x2a: 'SweepingLady',
+    0x2b: 'Hobo',
+    0x2c: 'Lumberjacks',
+    0x2d: 'TelepathicTile',
+    0x2e: 'FluteKid',
+    0x2f: 'RaceGameLady',
+
+    0x31: 'FortuneTeller',
+    0x32: 'ArgueBros',
+    0x33: 'RupeePull',
+    0x34: 'YoungSnitch',
+    0x35: 'Innkeeper',
+    0x36: 'Witch',
+    0x37: 'Waterfall',
+    0x38: 'EyeStatue',
+    0x39: 'Locksmith',
+    0x3a: 'MagicBat',
+    0x3b: 'BonkItem',
+    0x3c: 'KidInKak',
+    0x3d: 'OldSnitch',
+    0x3e: 'Hoarder2',
+    0x3f: 'TutorialGuard',
+
+    0x40: 'LightningGate',
+    0x41: 'BlueGuard',
+    0x42: 'GreenGuard',
+    0x43: 'RedSpearGuard',
+    0x44: 'BluesainBolt',
+    0x45: 'UsainBolt',
+    0x46: 'BlueArcher',
+    0x47: 'GreenBushGuard',
+    0x48: 'RedJavelinGuard',
+    0x49: 'RedBushGuard',
+    0x4a: 'BombGuard',
+    0x4b: 'GreenKnifeGuard',
+    0x4c: 'Geldman',
+    0x4d: 'Toppo',
+    0x4e: 'Popo',
+    0x4f: 'Popo2',
+
+    0x51: 'ArmosStatue',
+    0x52: 'KingZora',
+    0x53: 'ArmosKnight',
+    0x54: 'Lanmolas',
+    0x55: 'FireballZora',
+    0x56: 'Zora',
+    0x57: 'DesertStatue',
+    0x58: 'Crab',
+    0x59: 'LostWoodsBird',
+    0x5a: 'LostWoodsSquirrel',
+    0x5b: 'SparkCW',
+    0x5c: 'SparkCCW',
+    0x5d: 'RollerVerticalUp',
+    0x5e: 'RollerVerticalDown',
+    0x5f: 'RollerHorizontalLeft',
+    0x60: 'RollerHorizontalRight',
+    0x61: 'Beamos',
+    0x62: 'MasterSword',
+    0x63: 'DebirandoPit',
+    0x64: 'Debirando',
+    0x65: 'ArcheryNpc',
+    0x66: 'WallCannonVertLeft',
+    0x67: 'WallCannonVertRight',
+    0x68: 'WallCannonHorzTop',
+    0x69: 'WallCannonHorzBottom',
+    0x6a: 'BallNChain',
+    0x6b: 'CannonTrooper',
+    0x6d: 'CricketRat',
+    0x6e: 'Snake',
+    0x6f: 'Keese',
+
+    0x71: 'Leever',
+    0x72: 'FairyPondTrigger',
+    0x73: 'UnclePriest',
+    0x74: 'RunningNpc',
+    0x75: 'BottleMerchant',
+    0x76: 'Zelda',
+    0x78: 'Grandma',
+    0x7a: 'Agahnim',
+    0x7c: 'FloatingSkull',
+    0x7d: 'BigSpike',
+    0x7e: 'FirebarCW',
+    0x7f: 'FirebarCCW',
+    0x80: 'Firesnake',
+    0x81: 'Hover',
+    0x82: 'AntiFairyCircle',
+    0x83: 'GreenEyegoreMimic',
+    0x84: 'RedEyegoreMimic',
+    0x85: 'YellowStalfos',  # falling stalfos that shoots head
+    0x86: 'Kondongo',
+    0x88: 'Mothula',
+    0x8a: 'SpikeBlock',
+    0x8b: 'Gibdo',
+    0x8c: 'Arrghus',
+    0x8d: 'Arrghi',
+    0x8e: 'Terrorpin',
+    0x8f: 'Blob',
+    0x90: 'Wallmaster',
+    0x91: 'StalfosKnight',
+    0x92: 'HelmasaurKing',
+    0x93: 'Bumper',
+    0x94: 'Pirogusu',
+    0x95: 'LaserEyeLeft',
+    0x96: 'LaserEyeRight',
+    0x97: 'LaserEyeTop',
+    0x98: 'LaserEyeBottom',
+    0x99: 'Pengator',
+    0x9a: 'Kyameron',
+    0x9b: 'Wizzrobe',
+    0x9c: 'Zoro',  # babasu horizontal?
+    0x9d: 'Babasu',  # babasu vertical?
+    0x9e: 'GroveOstritch',
+    0x9f: 'GroveRabbit',
+    0xa0: 'GroveBird',
+    0xa1: 'Freezor',
+    0xa2: 'Kholdstare',
+    0xa3: 'KholdstareShell',
+    0xa4: 'FallingIce',
+    0xa5: 'BlueZazak',
+    0xa6: 'RedZazak',
+    0xa7: 'Stalfos',
+    0xa8: 'GreenZirro',
+    0xa9: 'BlueZirro',
+    0xaa: 'Pikit',
+    0xab: 'CrystalMaiden',
+    # ... OW
+    0xad: 'OldMan',
+    0xae: 'PipeDown',
+    0xaf: 'PipeUp',
+    0xb0: 'PipeRight',
+    0xb1: 'PipeLeft',
+    0xb2: 'GoodBee',
+    0xb3: 'PedestalPlaque',
+    0xb4: 'PurpleChest',
+    0xb5: 'BombShopGuy',
+    0xb6: 'Kiki',
+    0xb7: 'BlindMaiden',
+    0xb9: 'BullyPinkBall',
+
+    0xba: 'Whirlpool',
+    0xbb: 'Shopkeeper',
+    0xbc: 'Drunkard',
+    0xbd: 'Vitreous',
+    # ... (spawnables)
+    0xc0: 'Catfish',
+    0xc1: 'CutsceneAgahnim',
+    0xc2: 'Boulder',
+    0xc3: 'Gibo',  # patrick!
+    0xc4: 'Thief',
+    0xc5: 'Medusa',
+    0xc6: 'FourWayShooter',
+    0xc7: 'Pokey',
+    0xc8: 'BigFairy',
+    0xc9: 'Tektite',  # firebat?
+    0xca: 'Chainchomp',
+    0xcb: 'TrinexxRockHead',
+    0xcc: 'TrinexxFireHead',
+    0xcd: 'TrinexxIceHead',
+    0xce: 'Blind',
+    0xcf: 'Swamola',
+    0xd0: 'Lynel',
+    0xd1: 'BunnyBeam',
+    0xd2: 'FloppingFish',
+    0xd3: 'Stal',  # alive skull rock?
+    0xd5: 'DiggingGameNPC',
+    0xd6: 'Ganon',
+
+    0xe3: 'Faerie',
+    0xe4: 'SmallKey',
+    0xe8: 'FakeMasterSword',
+    0xe9: 'MagicShopAssistant',
+    0xeb: 'HeartPiece',
+    0xed: 'SomariaPlatform',
+    0xee: 'CastleMantle',
+    0xf2: 'MedallionTablet',
+}
\ No newline at end of file
diff --git a/source/dungeon/RoomConstants.py b/source/dungeon/RoomConstants.py
new file mode 100644
index 00000000..82df24fa
--- /dev/null
+++ b/source/dungeon/RoomConstants.py
@@ -0,0 +1,266 @@
+Ganon = 0x0
+HC_NorthCorridor = 0x1
+HC_SwitchRoom = 0x2
+HoulihanRoom = 0x3
+TR_CrystalRollerRoom = 0x4
+Swamp_Arrghus = 0x6
+Hera_Moldorm = 0x7
+Cave_HealingFairy = 0x8
+PalaceofDarkness0x09 = 0x9
+PoD_StalfosTrapRoom = 0xa
+PoD_TurtleRoom = 0xb
+GT_EntranceRoom = 0xc
+GT_Agahnim2 = 0xd
+Ice_EntranceRoom = 0xe
+GanonEvacuationRoute = 0x10
+HC_BombableStockRoom = 0x11
+Sanctuary = 0x12
+TR_Hokku_BokkuKeyRoom2 = 0x13
+TR_BigKeyRoom = 0x14
+TurtleRock0x15 = 0x15
+Swamp_SwimmingTreadmill = 0x16
+Hera_MoldormFallRoom = 0x17
+Cave0x18_BigFairyDropEntrance = 0x18
+PoD_DarkMaze = 0x19
+PoD_BigChestRoom = 0x1a
+PoD_Mimics_MovingWallRoom = 0x1b
+GT_IceArmos = 0x1c
+GT_FinalHallway = 0x1d
+Ice_BombFloor_BariRoom = 0x1e
+Ice_Pengator_BigKeyRoom = 0x1f
+Tower_Agahnim = 0x20
+HC_KeyRatRoom = 0x21
+HC_SewerTextTriggerRoom = 0x22
+TR_WestExittoBalcony = 0x23
+TR_DoubleHokku_Bokku_BigchestRoom = 0x24
+Swamp_StatueRoom = 0x26
+Hera_BigChest = 0x27
+Swamp_EntranceRoom = 0x28
+Skull_Mothula = 0x29
+PoD_BigHubRoom = 0x2a
+PoD_MapChest_FairyRoom = 0x2b
+Cave0x2C_HookshotCaveBackdoor = 0x2c
+Ice_CompassRoom = 0x2e
+Cave_KakarikoWellHP = 0x2f
+Tower_MaidenSacrificeChamber = 0x30
+Hera_HardhatBeetlesRoom = 0x31
+HC_SewerKeyChestRoom = 0x32
+Desert_Lanmolas = 0x33
+Swamp_PushBlockPuzzle_Pre_BigKeyRoom = 0x34
+Swamp_BigKey_BSRoom = 0x35
+Swamp_BigChestRoom = 0x36
+Swamp_MapChest_WaterFillRoom = 0x37
+Swamp_KeyPotRoom = 0x38
+Skull_GibdoKey_MothulaHoleRoom = 0x39
+PoD_BombableFloorRoom = 0x3a
+PoD_SpikeBlock_ConveyorRoom = 0x3b
+Cave0x3C_HookshotCave = 0x3c
+GT_TorchRoom2 = 0x3d
+Ice_StalfosKnights_ConveyorHellway = 0x3e
+Ice_MapChestRoom = 0x3f
+Tower_FinalBridgeRoom = 0x40
+HC_FirstDarkRoom = 0x41
+HC_6RopesRoom = 0x42
+Desert_TorchPuzzle_MovingWallRoom = 0x43
+TT_BigChestRoom = 0x44
+TT_JailCellsRoom = 0x45
+Swamp_CompassChestRoom = 0x46
+Skull_GibdoTorchPuzzleRoom = 0x49
+PoD_EntranceRoom = 0x4a
+PoD_Warps_SouthMimicsRoom = 0x4b
+GT_Mini_HelmasaurConveyorRoom = 0x4c
+GT_MoldormRoom = 0x4d
+Ice_Bomb_JumpRoom = 0x4e
+IcePalaceCloneRoom_FairyRoom = 0x4f
+HC_WestCorridor = 0x50
+HC_ThroneRoom = 0x51
+HC_EastCorridor = 0x52
+Desert_Popos2_BeamosHellwayRoom = 0x53
+Swamp_UpstairsPitsRoom = 0x54
+CastleSecretEntrance_UncleDeathRoom = 0x55
+Skull_KeyPot_TrapRoom = 0x56
+Skull_BigKeyRoom = 0x57
+Skull_BigChestRoom = 0x58
+Skull_FinalSectionEntranceRoom = 0x59
+PoD_HelmasaurKing = 0x5a
+GT_SpikePitRoom = 0x5b
+GT_Ganon_BallZ = 0x5c
+GT_Gauntlet1_2_3 = 0x5d
+Ice_LonelyFirebar = 0x5e
+Ice_HiddenChest_SpikeFloorRoom = 0x5f
+HC_WestEntranceRoom = 0x60
+HC_MainEntranceRoom = 0x61
+HC_EastEntranceRoom = 0x62
+Desert_FinalSectionEntranceRoom = 0x63
+TT_WestAtticRoom = 0x64
+TT_EastAtticRoom = 0x65
+Swamp_HiddenChest_HiddenDoorRoom = 0x66
+Skull_CompassChestRoom = 0x67
+Skull_KeyChest_TrapRoom = 0x68
+PoD_RupeeRoom = 0x6a
+GT_MimicsRooms = 0x6b
+GT_LanmolasRoom = 0x6c
+GT_Gauntlet4_5 = 0x6d
+Ice_PengatorsRoom = 0x6e
+HC_SmallCorridortoJailCells = 0x70
+HC_BoomerangChestRoom = 0x71
+HC_MapChestRoom = 0x72
+Desert_BigChestRoom = 0x73
+Desert_MapChestRoom = 0x74
+Desert_BigKeyChestRoom = 0x75
+Swamp_WaterDrainRoom = 0x76
+Hera_EntranceRoom = 0x77
+GanonsTower = 0x7b
+GT_EastSideCollapsingBridge_ExplodingWallRoom = 0x7c
+GT_Winder_WarpMazeRoom = 0x7d
+Ice_HiddenChest_BombableFloorRoom = 0x7e
+Ice_BigSpikeTrapsRoom = 0x7f
+HC_JailCellRoom = 0x80
+HC_NextToChasmRoom = 0x81
+HC_BasementChasmRoom = 0x82
+Desert_WestEntranceRoom = 0x83
+Desert_MainEntranceRoom = 0x84
+Desert_EastEntranceRoom = 0x85
+Hera_TileRoom = 0x87
+Eastern_FairyRoom = 0x89
+GT_BlockPuzzle_SpikeSkip_MapChestRoom = 0x8b
+GT_EastandWestDownstairs_BigChestRoom = 0x8c
+GT_Tile_TorchPuzzleRoom = 0x8d
+IcePalace0x8E = 0x8e
+Mire_Vitreous = 0x90
+Mire_FinalSwitchRoom = 0x91
+Mire_DarkBombWall_SwitchesRoom = 0x92
+Mire_DarkCaneFloorSwitchPuzzleRoom = 0x93
+GT_FinalCollapsingBridgeRoom = 0x95
+GT_Torches1Room = 0x96
+Mire_TorchPuzzle_MovingWallRoom = 0x97
+Mire_EntranceRoom = 0x98
+Eastern_EyegoreKeyRoom = 0x99
+GT_ManySpikes_WarpMazeRoom = 0x9b
+GT_InvisibleFloorMazeRoom = 0x9c
+GT_CompassChest_InvisibleFloorRoom = 0x9d
+Ice_BigChestRoom = 0x9e
+IcePalace0x9F = 0x9f
+Mire_Pre_VitreousRoom = 0xa0
+Mire_FishRoom = 0xa1
+Mire_BridgeKeyChestRoom = 0xa2
+MiseryMire0xA3 = 0xa3
+TR_Trinexx = 0xa4
+GT_WizzrobesRooms = 0xa5
+GT_MoldormFallRoom = 0xa6
+Hera_FairyRoom = 0xa7
+Eastern_StalfosSpawnRoom = 0xa8
+Eastern_BigChestRoom = 0xa9
+Eastern_MapChestRoom = 0xaa
+TT_MovingSpikes_KeyPotRoom = 0xab
+TT_BlindTheThief = 0xac
+IcePalace0xAE = 0xae
+Ice_IceBridgeRoom = 0xaf
+Tower_CircleofPots = 0xb0
+Mire_HourglassRoom = 0xb1
+Mire_SlugRoom = 0xb2
+Mire_SpikeKeyChestRoom = 0xb3
+TR_Pre_TrinexxRoom = 0xb4
+TR_DarkMaze = 0xb5
+TR_ChainChompsRoom = 0xb6
+TR_MapChest_KeyChest_RollerRoom = 0xb7
+Eastern_BigKeyRoom = 0xb8
+Eastern_LobbyCannonballsRoom = 0xb9
+Eastern_DarkAntifairy_KeyPotRoom = 0xba
+TT_Hellway = 0xbb
+TT_ConveyorToilet = 0xbc
+Ice_BlockPuzzleRoom = 0xbe
+IcePalaceCloneRoom_SwitchRoom = 0xbf
+Tower_DarkBridgeRoom = 0xc0
+Mire_CompassChest_TileRoom = 0xc1
+Mire_BigHubRoom = 0xc2
+Mire_BigChestRoom = 0xc3
+TR_FinalCrystalSwitchPuzzleRoom = 0xc4
+TR_LaserBridge = 0xc5
+TurtleRock0xC6 = 0xc6
+TR_TorchPuzzle = 0xc7
+Eastern_ArmosKnights = 0xc8
+Eastern_EntranceRoom = 0xc9
+UnknownRoom = 0xca
+TT_NorthWestEntranceRoom = 0xcb
+TT_NorthEastEntranceRoom = 0xcc
+Ice_HoletoKholdstareRoom = 0xce
+Tower_DarkMaze = 0xd0
+Mire_ConveyorSlug_BigKeyRoom = 0xd1
+Mire_Mire02_WizzrobesRoom = 0xd2
+TR_LaserKeyRoom = 0xd5
+TR_EntranceRoom = 0xd6
+Eastern_PreArmosKnightsRoom = 0xd8
+Eastern_CanonballRoom = 0xd9
+EasternPalace = 0xda
+TT_Main_SouthWestEntranceRoom = 0xdb
+TT_SouthEastEntranceRoom = 0xdc
+Ice_Kholdstare = 0xde
+Cave_BackwardsDeathMountainTopFloor = 0xdf
+Tower_EntranceRoom = 0xe0
+Cave_LostWoodsHP = 0xe1
+Cave_LumberjacksTreeHP = 0xe2
+Cave_HalfMagic = 0xe3
+Cave_LostOldManFinalCave = 0xe4
+Cave_LostOldManFinalCave2 = 0xe5
+Cave0xE6 = 0xe6
+Cave0xE7 = 0xe7
+Cave0xE8 = 0xe8
+Cave_SpectacleRockHP = 0xea
+Cave0xEB = 0xeb
+Cave0xED = 0xed
+Cave_SpiralCave = 0xee
+Cave_CrystalSwitch_5ChestsRoom = 0xef
+Cave_LostOldManStartingCave = 0xf0
+Cave_LostOldManStartingCave2 = 0xf1
+House = 0xf2
+House_OldWoman = 0xf3
+House_AngryBrothers = 0xf4
+House_AngryBrothers2 = 0xf5
+Cave0xF8 = 0xf8
+Cave0xF9 = 0xf9
+Cave0xFA = 0xfa
+Cave0xFB = 0xfb
+Cave0xFD = 0xfd
+Cave0xFE = 0xfe
+Cave0xFF = 0xff
+ShopInLostWoods0x100 = 0x100
+ScaredLadyHouses = 0x101
+SickKid = 0x102
+Inn_BushHouse = 0x103
+LinksHouse = 0x104
+ShabadooHouse = 0x105
+ChestGame_BombHouse = 0x106
+Library_BombFarmRoom = 0x107
+ChickenHouse = 0x108
+WitchHut = 0x109
+Aginah = 0x10a
+SwampFloodwayRoom = 0x10b
+MimicCave = 0x10c
+CaveOutsideMiseryMire = 0x10d
+Cave0x10E = 0x10e
+Shop0x10F = 0x10f
+Shop0x110 = 0x110
+ArcherGame = 0x111
+CaveShop0x112 = 0x112
+KingsTomb = 0x113
+WishingWell_Cave0x114 = 0x114
+WishingWell_BigFairy = 0x115
+FatFairy = 0x116
+SpikeCave = 0x117
+Shop0x118 = 0x118
+BlindsHouse = 0x119
+Mutant = 0x11a
+MirrorCaveGroveAndTomb = 0x11b
+BombShop = 0x11c
+BlindsBasement = 0x11d
+HypeCave = 0x11e
+Shop0x11F = 0x11f
+IceRodCave = 0x120
+SmithHouse = 0x121
+FortuneTellers = 0x122
+MiniMoldormCave = 0x123
+UnknownCave_BonkCave = 0x124
+Cave0x125 = 0x125
+CheckerBoardCave = 0x126
+HammerPegCave = 0x127
\ No newline at end of file
diff --git a/source/dungeon/RoomHeader.py b/source/dungeon/RoomHeader.py
new file mode 100644
index 00000000..13a4f7b7
--- /dev/null
+++ b/source/dungeon/RoomHeader.py
@@ -0,0 +1,326 @@
+
+
+vanilla_headers = {
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+	0x00E9: [0x20, 0x20, 0x06, 0x13, 0x00, 0x00, 0x00, 0x00, 0x00, 0xFA, 0xFA, 0x20, 0x07, 0x06],
+	0x00EA: [0x20, 0x20, 0x06, 0x13, 0x00, 0x00, 0x00, 0x00, 0x00, 0xFA, 0xFA, 0x20, 0x07, 0x06],
+	0x00EB: [0x20, 0x07, 0x06, 0x19, 0x00, 0x00, 0x00, 0x00, 0x00, 0xFB, 0xFB, 0x20, 0x20, 0x06],
+	0x00EC: [0x20, 0x20, 0x06, 0x13, 0x00, 0x00, 0x00, 0x00, 0x00, 0xFD, 0xFD, 0xFD, 0x20, 0x20],
+	0x00ED: [0x20, 0x20, 0x06, 0x13, 0x00, 0x00, 0x00, 0x00, 0x00, 0xFD, 0xFD, 0xFD, 0x20, 0x20],
+	0x00EE: [0x20, 0x20, 0x06, 0x13, 0x00, 0x00, 0x00, 0x00, 0x00, 0xFE, 0x20, 0x20, 0x06, 0x13],
+	0x00EF: [0x20, 0x20, 0x06, 0x13, 0x00, 0x02, 0x00, 0x08, 0x00, 0xFF, 0xDF, 0xFF, 0x00, 0x02],
+	0x00F0: [0x01, 0x07, 0x06, 0x01, 0x00, 0x00, 0x00, 0x20, 0x07, 0x06, 0x13, 0x00, 0x00, 0x00],
+	0x00F1: [0x01, 0x07, 0x06, 0x01, 0x00, 0x00, 0x00, 0x20, 0x07, 0x06, 0x13, 0x00, 0x00, 0x00],
+	0x00F2: [0x00, 0x02, 0x03, 0x05, 0x00, 0x00, 0x02, 0x03, 0x0F, 0x00, 0x00, 0x00, 0x00, 0x07],
+	0x00F3: [0x00, 0x02, 0x03, 0x05, 0x00, 0x00, 0x02, 0x03, 0x0F, 0x00, 0x00, 0x00, 0x00, 0x07],
+	0x00F4: [0x00, 0x02, 0x03, 0x0F, 0x00, 0x00, 0x00, 0x00, 0x07, 0x06, 0x13, 0x00, 0x00, 0x00],
+	0x00F5: [0x00, 0x02, 0x03, 0x0F, 0x00, 0x00, 0x00, 0x00, 0x07, 0x06, 0x13, 0x00, 0x00, 0x00],
+	0x00F6: [0x00, 0x07, 0x06, 0x13, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xE8, 0xE8, 0xE8, 0xE8],
+	0x00F7: [0x00, 0x07, 0x06, 0x13, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xE8, 0xE8, 0xE8, 0xE8],
+	0x00F8: [0x00, 0x07, 0x06, 0x13, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xE8, 0xE8, 0xE8, 0xE8],
+	0x00F9: [0x00, 0x20, 0x06, 0x13, 0x00, 0x00, 0x00, 0xC0, 0x20, 0x06, 0x13, 0x00, 0x00, 0x00],
+	0x00FA: [0xC0, 0x20, 0x06, 0x13, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xEA, 0x00, 0x07, 0x06],
+	0x00FB: [0x00, 0x07, 0x06, 0x19, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xEB, 0x00, 0x20, 0x06],
+	0x00FC: [0x00, 0x20, 0x06, 0x13, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xED, 0xED, 0x00, 0x07],
+	0x00FD: [0x00, 0x20, 0x06, 0x13, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xED, 0xED, 0x00, 0x07],
+	0x00FE: [0x00, 0x20, 0x06, 0x13, 0x00, 0x00, 0x00, 0xC0, 0x20, 0x06, 0x13, 0x00, 0x00, 0x00],
+	0x00FF: [0x00, 0x07, 0x06, 0x05, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xEF, 0x00, 0x05, 0x03],
+	0x0100: [0x00, 0x05, 0x03, 0x28, 0x00, 0x00, 0x00, 0x00, 0x1F, 0x03, 0x05, 0x00, 0x00, 0x00],
+	0x0101: [0x00, 0x02, 0x03, 0x0F, 0x00, 0x00, 0x00, 0x00, 0x15, 0x03, 0x0D, 0x00, 0x00, 0x00],
+	0x0102: [0x00, 0x15, 0x03, 0x0D, 0x00, 0x00, 0x00, 0x00, 0x05, 0x03, 0x0F, 0x00, 0x00, 0x00],
+	0x0103: [0x00, 0x05, 0x03, 0x0F, 0x00, 0x00, 0x00, 0x01, 0x15, 0x03, 0x0D, 0x00, 0x00, 0x00],
+	0x0104: [0x01, 0x15, 0x03, 0x0D, 0x00, 0x00, 0x00, 0x00, 0x1C, 0x0F, 0x10, 0x00, 0x00, 0x00],
+	0x0105: [0x00, 0x1C, 0x0F, 0x10, 0x00, 0x00, 0x00, 0x00, 0x1F, 0x03, 0x0F, 0x00, 0x00, 0x00],
+	0x0106: [0x00, 0x1F, 0x03, 0x0F, 0x00, 0x00, 0x00, 0x00, 0x02, 0x03, 0x01, 0x00, 0x00, 0x00],
+	0x0107: [0x00, 0x02, 0x03, 0x01, 0x00, 0x00, 0x00, 0x00, 0x02, 0x03, 0x0E, 0x00, 0x00, 0x00],
+	0x0108: [0x00, 0x02, 0x03, 0x0E, 0x00, 0x00, 0x00, 0x01, 0x05, 0x03, 0x05, 0x00, 0x00, 0x00],
+	0x0109: [0x01, 0x05, 0x03, 0x05, 0x00, 0x00, 0x00, 0x01, 0x07, 0x06, 0x10, 0x00, 0x00, 0x00],
+	0x010A: [0x01, 0x07, 0x06, 0x10, 0x00, 0x00, 0x00, 0x80, 0x0A, 0x08, 0x08, 0x00, 0x00, 0x1A],
+	0x010B: [0x80, 0x0A, 0x08, 0x08, 0x00, 0x00, 0x1A, 0x00, 0x27, 0x06, 0x08, 0x00, 0x03, 0x00],
+	0x010C: [0x00, 0x27, 0x06, 0x08, 0x00, 0x03, 0x00, 0x00, 0x0A, 0x08, 0x11, 0x00, 0x00, 0x00],
+	0x010D: [0x00, 0x0A, 0x08, 0x11, 0x00, 0x00, 0x00, 0x00, 0x07, 0x14, 0x05, 0x00, 0x00, 0x00],
+	0x010E: [0x00, 0x07, 0x14, 0x05, 0x00, 0x00, 0x00, 0x00, 0x1E, 0x11, 0x05, 0x00, 0x00, 0x00],
+	0x010F: [0x00, 0x1F, 0x03, 0x05, 0x00, 0x00, 0x00, 0x00, 0x02, 0x03, 0x0F, 0x00, 0x00, 0x00],
+	0x0110: [0x00, 0x1F, 0x03, 0x05, 0x00, 0x00, 0x00, 0x00, 0x02, 0x03, 0x0F, 0x00, 0x00, 0x00],
+	0x0111: [0x00, 0x1E, 0x11, 0x05, 0x00, 0x00, 0x00, 0x00, 0x07, 0x14, 0x05, 0x00, 0x00, 0x00],
+	0x0112: [0x00, 0x07, 0x14, 0x05, 0x00, 0x00, 0x00, 0x00, 0x03, 0x10, 0x08, 0x00, 0x00, 0x00],
+	0x0113: [0x00, 0x03, 0x10, 0x08, 0x00, 0x00, 0x00, 0x00, 0x07, 0x06, 0x07, 0x00, 0x00, 0x00],
+	0x0114: [0x00, 0x07, 0x06, 0x07, 0x00, 0x00, 0x00, 0x00, 0x22, 0x12, 0x07, 0x00, 0x00, 0x00],
+	0x0115: [0x00, 0x07, 0x06, 0x07, 0x00, 0x00, 0x00, 0x00, 0x22, 0x12, 0x07, 0x00, 0x00, 0x00],
+	0x0116: [0x00, 0x22, 0x12, 0x07, 0x00, 0x00, 0x00, 0x00, 0x20, 0x14, 0x05, 0x00, 0x00, 0x00],
+	0x0117: [0x00, 0x20, 0x14, 0x05, 0x00, 0x00, 0x00, 0xE0, 0x23, 0x0A, 0x0F, 0x00, 0x00, 0x00],
+	0x0118: [0x00, 0x05, 0x03, 0x0F, 0x00, 0x00, 0x00, 0x01, 0x15, 0x03, 0x0D, 0x00, 0x00, 0x00],
+	0x0119: [0xE0, 0x23, 0x0A, 0x0F, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x1D, 0x00, 0x1C, 0x0F],
+	0x011A: [0x00, 0x1C, 0x0F, 0x05, 0x00, 0x00, 0x00, 0xC0, 0x07, 0x06, 0x08, 0x00, 0x00, 0x00],
+	0x011B: [0xC0, 0x07, 0x06, 0x08, 0x00, 0x00, 0x00, 0x00, 0x23, 0x0A, 0x0F, 0x00, 0x00, 0x00],
+	0x011C: [0x00, 0x1F, 0x03, 0x05, 0x00, 0x00, 0x00, 0x00, 0x02, 0x03, 0x0F, 0x00, 0x00, 0x00],
+	0x011D: [0x00, 0x23, 0x0A, 0x0F, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x19, 0x00, 0x20, 0x06],
+	0x011E: [0x00, 0x20, 0x06, 0x2A, 0x00, 0x00, 0x00, 0x00, 0x05, 0x03, 0x05, 0x00, 0x00, 0x00],
+	0x011F: [0x00, 0x05, 0x03, 0x05, 0x00, 0x00, 0x00, 0x00, 0x13, 0x06, 0x13, 0x00, 0x00, 0x00],
+	0x0120: [0x00, 0x13, 0x06, 0x13, 0x00, 0x00, 0x00, 0x00, 0x07, 0x06, 0x28, 0x00, 0x03, 0x00],
+	0x0121: [0x00, 0x1E, 0x11, 0x05, 0x00, 0x00, 0x00, 0x00, 0x07, 0x14, 0x05, 0x00, 0x00, 0x00],
+	0x0122: [0x00, 0x1E, 0x11, 0x05, 0x00, 0x00, 0x00, 0x00, 0x07, 0x14, 0x05, 0x00, 0x00, 0x00],
+	0x0123: [0x00, 0x07, 0x06, 0x28, 0x00, 0x03, 0x00, 0x00, 0x07, 0x06, 0x28, 0x00, 0x00, 0x00],
+	0x0124: [0x00, 0x07, 0x06, 0x28, 0x00, 0x00, 0x00, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF],
+	0x0125: [0x00, 0x07, 0x06, 0x28, 0x00, 0x00, 0x00, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF],
+	0x0126: [0x00, 0x07, 0x06, 0x28, 0x00, 0x00, 0x00, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF],
+	0x0127: [0x00, 0x20, 0x06, 0x2A, 0x00, 0x00, 0x00, 0x00, 0x05, 0x03, 0x05, 0x00, 0x00, 0x00],
+	0x0128: [0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF],
+	0x0129: [0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF],
+	0x012A: [0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF],
+	0x012B: [0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF],
+	0x012C: [0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF],
+	0x012D: [0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF],
+	0x012E: [0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF]
+}
+
+
+class RoomHeader:
+	def __init__(self, room_id, byte_array):
+		self.room_id = room_id
+
+		# todo: the rest of the header
+		self.sprite_sheet = byte_array[3]
+
+	def write_to_rom(self, rom, base_address):
+		rom.write_byte(base_address + self.room_id*14 + 3, self.sprite_sheet)
+
+
+def init_room_headers():
+	header_table = {}
+	for room_id, header_bytes in vanilla_headers.items():
+		header_table[room_id] = RoomHeader(room_id, header_bytes)
+	return header_table
+
diff --git a/source/dungeon/RoomList.py b/source/dungeon/RoomList.py
index 4b8c2a75..ceff9405 100644
--- a/source/dungeon/RoomList.py
+++ b/source/dungeon/RoomList.py
@@ -1,3 +1,9 @@
+try:
+    from fast_enum import FastEnum
+except ImportError:
+    from enum import IntFlag as FastEnum
+
+
 from RoomData import DoorKind, Position
 from source.dungeon.RoomObject import RoomObject, DoorObject
 
diff --git a/source/dungeon/__init__.py b/source/dungeon/__init__.py
new file mode 100644
index 00000000..724252e9
--- /dev/null
+++ b/source/dungeon/__init__.py
@@ -0,0 +1 @@
+# do nothing, just exist to make "source" package
diff --git a/source/enemizer/Enemizer.py b/source/enemizer/Enemizer.py
new file mode 100644
index 00000000..dfea8102
--- /dev/null
+++ b/source/enemizer/Enemizer.py
@@ -0,0 +1,253 @@
+import RaceRandom as random
+
+from source.dungeon.EnemyList import SpriteType
+from source.enemizer.SpriteSheets import uw_sub_group_choices, setup_required_dungeon_groups
+
+water_rooms = {
+    0x16, 0x28, 0x34, 0x36, 0x38, 0x46, 0x66
+}  # these room need to be locked on the gfx ID : 17
+
+# todo: task list
+# anti-fairy shutter logic
+# check cucco, implement flag for certain immune enemies that are okay in shutter rooms
+# Room 0x16 (sprites 4,5,6 need to be water but 0-3 don't)
+#
+
+shutter_sprites = {
+    0xb8: {0, 1, 2, 3, 4, 5}, 0xb: {4, 5, 6, 7, 8, 9}, 0x1b: {3, 4, 5}, 0x4b: {0, 3, 4}, 0x4: {9, 13, 14},
+    0x24: {3, 5, 6}, # not sure about 6 - bunny beam under pot
+    0x28: {0, 1, 2, 3, 4}, 0xe: {0, 1, 2, 3}, 0x2e: {0, 1, 2, 3, 4, 5}, 0x3e: {1, 2}, 0x6e: {0, 1, 2, 3, 4},
+    0x31: {7, 8, 10}, 0x44: {2, 3, 5}, 0x45: {1, 2, 3},  0x53: {5, 6, 8, 9, 10}, 0x75: {0, 2, 3, 4, 5},
+    0x85: {2, 3, 4, 5}, 0x5d: {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12}, 0x6b: {5, 6, 7, 8, 9, 10, 11, 12, 13},
+    0x6d: {0, 1, 2, 3, 4, 5, 6, 7, 8}, 0x7b: {3, 4, 8}, 0x7d: {4, 5, 6, 7, 8}, 0x8d: {0, 1, 2, 3, 4},
+    0xa5: {0, 1, 2, 3, 4, 5, 6, 7}, 0x71: {0, 1}, 0xd8: {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10},
+    0xb0: {0, 1, 2, 3, 4, 5, 7, 8, 9, 10}, 0xc0: {0, 1, 2}, 0xe0: {0, 1, 2, 3}, 0xb2: {5, 6, 7, 10, 11},
+    0xd2: {0, 1, 2, 3, 4, 5, 6, 7, 8, 9}, 0xef: {0, 1, 2}, 0x10c: {4, 5, 6, 7}, 0x123: {0, 1, 2, 3}
+}
+
+water_sprites = {
+    0x16: {4, 5, 6}, 0x28: {0, 1, 2, 3}, 0x34: {0, 1, 2}, 0x36: {1, 2, 5, 7, 8}, 0x38: {0, 1, 2, 4, 5, 6},
+}
+
+# not really shutters: only tiles:
+# 0xb6 TR Tile, TR Pokey 1, Chain chomp?
+# 0x87 hera tile room?
+# 0x3d gt minihelma?
+# 0x8d gt tile room?
+# 0x96 gt torch cross?
+
+
+def setup_specific_requirements(data_tables):
+    requirements = data_tables.sprite_requirements
+    water_groups = set()
+    water_sub_groups = {0: set(), 1: set(), 2: set(), 3: set()}
+    killable_groups = set()
+    killable_sub_groups = {0: set(), 1: set(), 2: set(), 3: set()}
+    key_groups = set()
+    key_sub_groups = {0: set(), 1: set(), 2: set(), 3: set()}
+
+    for sid, requirement in requirements.items():
+        if isinstance(requirement, dict):
+            continue
+        if requirement.good_for_uw_water():
+            water_groups.update(requirement.groups)
+            for i in range(0, 4):
+                limited = [x for x in requirement.sub_groups[i] if x in uw_sub_group_choices[i]]
+                water_sub_groups[i].update(limited)
+        if requirement.good_for_shutter():
+            killable_groups.update(requirement.groups)
+            for i in range(0, 4):
+                killable_sub_groups[i].update(requirement.sub_groups[i])
+            if requirement.can_drop:
+                key_groups.update(requirement.groups)
+                for i in range(0, 4):
+                    key_sub_groups[i].update(requirement.sub_groups[i])
+    return water_groups, water_sub_groups, killable_groups, killable_sub_groups, key_groups, key_sub_groups
+
+
+def get_possible_sheets(room_id, data_tables, specific, uw_sheets):
+    # forced sprites for room
+    requirements = data_tables.sprite_requirements
+
+    water_groups, water_sub_groups, killable_groups, killable_sub_groups, key_groups, key_sub_groups = specific
+
+    # forced_req = set()
+    key_needed = False
+    killable_needed = room_id in shutter_sprites
+    water_needed = room_id in water_rooms
+
+    for sheet in data_tables.sprite_sheets.values():
+        if room_id in sheet.room_set:
+            return [sheet]
+
+    match_all_room_groups = set()
+    match_all_sub_groups = {0: set(), 1: set(), 2: set(), 3: set()}
+    # match_all_sub_groups = {0: set(uw_sub_group_choices[0] + [70, 72]), 1: set(uw_sub_group_choices[1] + [13, 73]),
+    #                          2: set(uw_sub_group_choices[2] + [19]), 3: set(uw_sub_group_choices[3] + [25, 68])}
+    
+    for sprite in data_tables.uw_enemy_table.room_map[room_id]:
+        sprite_secondary = 0 if sprite.sub_type != SpriteType.Overlord else sprite.sub_type
+        key = (sprite.kind, sprite_secondary)
+        if key not in requirements:
+            continue
+        req = requirements[key]
+        if isinstance(req, dict):
+            req = req[room_id]
+        if req.static or not req.can_randomize:
+            if req.groups:
+                match_all_room_groups.intersection_update(req.groups)
+                if not match_all_room_groups:
+                    match_all_room_groups = set(req.groups)
+            for i in range(0, 4):
+                if req.sub_groups[i]:
+                    match_all_sub_groups[i].intersection_update(req.sub_groups[i])
+                    if not match_all_sub_groups[i]:
+                        match_all_sub_groups[i] = set(req.sub_groups[i])
+            # forced_req.add(req)
+            if sprite.drops_item:
+                key_needed = True
+
+    match_any_room_groups = set()
+    match_any_sub_groups = {0: set(), 1: set(), 2: set(), 3: set()}
+    exclude_all_groups = set()
+    exclude_all_sub_groups = {0: set(), 1: set(), 2: set(), 3: set()}
+
+    if water_needed:
+        if water_groups:
+            match_any_room_groups.update(water_groups)
+        for i in range(0, 4):
+            if water_sub_groups[i]:
+                match_any_sub_groups[i].update(water_sub_groups[i])
+    else:  # exclude water stuff
+        exclude_all_groups.update(water_groups)
+        for i in range(0, 4):
+            exclude_all_sub_groups[i].update(water_sub_groups[i])
+
+    if key_needed:
+        if key_groups:
+            match_any_room_groups.update(key_groups)
+            for i in range(0, 4):
+                if key_sub_groups[i]:
+                    match_any_sub_groups[i].update(key_sub_groups[i])
+    elif killable_needed:
+        if killable_groups:
+            match_any_room_groups.update(killable_groups)
+            for i in range(0, 4):
+                if killable_sub_groups[i]:
+                    match_any_sub_groups[i].update(killable_sub_groups[i])
+
+    possible_sheets = []
+    for sheet in uw_sheets:
+        str(sheet)
+        if match_all_room_groups and sheet not in match_all_room_groups:
+            continue
+        if any(match_all_sub_groups[i] and sheet.sub_groups[i] not in match_all_sub_groups[i] for i in range(0, 4)):
+            continue
+        if exclude_all_groups and sheet in exclude_all_groups:
+            continue
+        if any(exclude_all_sub_groups[i] and sheet.sub_groups[i] in exclude_all_sub_groups[i] for i in range(0, 4)):
+            continue
+        if match_any_room_groups and sheet not in match_any_sub_groups:
+            continue
+        test_subs = [i for i in range(0, 4) if match_any_sub_groups[i]]
+        if test_subs and all(sheet.sub_groups[i] not in match_any_sub_groups[i] for i in test_subs):
+            continue
+        possible_sheets.append(sheet)
+    return possible_sheets
+
+
+def uw_candidate_sprites(data_tables):
+    requirements = data_tables.sprite_requirements
+    uw_sprite_candidates = []
+    uw_sheet_candidates = []
+
+    candidate_groups = set()
+    candidate_sub_groups = {0: set(), 1: set(), 2: set(), 3: set()}
+
+    for k, r in requirements.items():
+        if isinstance(r, dict):
+            continue
+        if not r.static and r.uw_valid and not r.dont_use:
+            candidate_groups.update(r.groups)
+            for i in range(0, 4):
+                candidate_sub_groups[i].update(r.sub_groups[i])
+            uw_sprite_candidates.append(k)
+
+    for num in range(65, 124):
+        sheet = data_tables.sprite_sheets[num]
+        if candidate_groups and sheet not in candidate_groups:
+            continue
+        test_subs = [i for i in range(0, 4) if candidate_sub_groups[i]]
+        if test_subs and all(sheet.sub_groups[i] not in candidate_sub_groups[i] for i in test_subs):
+            continue
+        uw_sheet_candidates.append(sheet)
+
+    return uw_sprite_candidates, uw_sheet_candidates
+
+
+def get_possible_enemy_sprites(room_id, sheet, uw_sprites, data_tables):
+    ret = []
+    for sprite in uw_sprites:
+        requirement = data_tables.sprite_requirements[sprite]
+        if isinstance(requirement, dict):
+            requirement = requirement[room_id]
+        if sheet.valid_sprite(requirement) and requirement.can_spawn_in_room(room_id):
+            ret.append(requirement)
+    return ret
+
+
+def get_randomize_able_sprites(room_id, data_tables):
+    sprite_table = {}
+    for idx, sprite in enumerate(data_tables.uw_enemy_table.room_map[room_id]):
+        sprite_secondary = 0 if sprite.sub_type != SpriteType.Overlord else sprite.sub_type
+        key = (sprite.kind, sprite_secondary)
+        if key not in data_tables.sprite_requirements:
+            continue
+        req = data_tables.sprite_requirements[key]
+        if isinstance(req, dict):
+            continue
+        if not req.static and req.can_randomize:
+            sprite_table[idx] = sprite
+    return sprite_table
+
+
+# RandomizeRooms(optionFlags);
+def randomize_underworld_rooms(data_tables):
+    # RoomCollection.RandomizeRoomSpriteGroups
+    # randomize room sprite sheets
+
+    specific = setup_specific_requirements(data_tables)
+    uw_candidates, uw_sheets = uw_candidate_sprites(data_tables)
+    for room_id in range(0, 0x128):
+        if room_id in {0, 1, 3, 6, 7, 0xd, 0x14, 0x1c, 0x20, 0x29, 0x30, 0x33,
+                       0x4d, 0x5a, 0x7F, 0x90, 0xa4, 0xac, 0xc8, 0xde}:
+            continue
+        if room_id not in data_tables.uw_enemy_table.room_map:
+            continue
+        # sprite_reqs = data_tables.sprite_requirements
+        randomizeable_sprites = get_randomize_able_sprites(room_id, data_tables)
+        if randomizeable_sprites:
+            candidate_sheets = get_possible_sheets(room_id, data_tables, specific, uw_sheets)
+            chosen_sheet = random.choice(candidate_sheets)
+            data_tables.room_headers[room_id].sprite_sheet = chosen_sheet.id - 0x40
+            candidate_sprites = get_possible_enemy_sprites(room_id, chosen_sheet, uw_candidates, data_tables)
+            if room_id in water_rooms:
+                water_sprites = [x for x in candidate_sprites if x.water_only]
+                for i, sprite in randomizeable_sprites.items():
+                    chosen = random.choice(water_sprites)
+                    sprite.kind = chosen.sprite
+            else:
+                # todo: stal sprites
+                for i, sprite in randomizeable_sprites.items():
+                    if sprite.drops_item:
+                        key_sprites = [x for x in candidate_sprites if x.good_for_key_drop() and not x.water_only]
+                        chosen = random.choice(key_sprites)
+                    elif room_id in shutter_sprites and i in shutter_sprites[room_id]:
+                        killable_sprite = [x for x in candidate_sprites if x.good_for_shutter() and not x.water_only]
+                        chosen = random.choice(killable_sprite)
+                    else:
+                        non_water = [x for x in candidate_sprites if not x.water_only]
+                        chosen = random.choice(non_water)
+                    sprite.kind = chosen.sprite
+        # done with sprites
+    # done with rooms
\ No newline at end of file
diff --git a/source/enemizer/EnemizerTestHarness.py b/source/enemizer/EnemizerTestHarness.py
new file mode 100644
index 00000000..09395da1
--- /dev/null
+++ b/source/enemizer/EnemizerTestHarness.py
@@ -0,0 +1,19 @@
+from source.dungeon.EnemyList import enemy_names, SpriteType
+from source.enemizer.Enemizer import randomize_underworld_rooms
+from source.enemizer.SpriteSheets import randomize_underworld_sprite_sheets
+from source.rom.DataTables import init_data_tables
+import RaceRandom as random
+
+if __name__ == '__main__':
+    random.seed(42)
+    data_tables = init_data_tables(None, None)
+
+    randomize_underworld_sprite_sheets(data_tables.sprite_sheets)
+    randomize_underworld_rooms(data_tables)
+    for room_id, enemy_list in data_tables.uw_enemy_table.room_map.items():
+        print(f'Room {hex(room_id)}:')
+        for i, sprite in enumerate(enemy_list):
+            if sprite.sub_type == SpriteType.Overlord:
+                print(f'  Overlord #{i+1} {hex(sprite.kind)}:')
+            else:
+                print(f'  Enemy #{i+1} {enemy_names[sprite.kind]}:')
diff --git a/source/enemizer/SpriteSheets.py b/source/enemizer/SpriteSheets.py
new file mode 100644
index 00000000..9b6a877a
--- /dev/null
+++ b/source/enemizer/SpriteSheets.py
@@ -0,0 +1,630 @@
+from collections import defaultdict
+import RaceRandom as random
+
+from source.dungeon.EnemyList import EnemySprite, enemy_names
+from source.dungeon.RoomConstants import *
+
+
+class SpriteRequirement:
+    def __init__(self, sprite, overlord=0):
+        self.sprite = sprite
+        self.overlord = overlord
+
+        self.boss = False
+        self.static = False  # npcs and do not randomize
+        self.killable = True
+        self.can_drop = True
+        self.water_only = False
+        self.dont_use = False
+        self.ow_valid = True
+        self.uw_valid = True
+        self.can_randomize = True
+
+        self.groups = []
+        self.sub_groups = defaultdict(list)
+
+        self.excluded_rooms = set()
+        self.allowed_rooms = set()
+
+    def can_spawn_in_room(self, room_id):
+        return room_id not in self.excluded_rooms and (self.sprite != EnemySprite.Wallmaster or room_id < 0x100)
+
+    def no_drop(self):
+        self.can_drop = False
+        return self
+
+    def sub_group(self, key, subs):
+        if isinstance(subs, list):
+            self.sub_groups[key].extend(subs)
+        else:
+            self.sub_groups[key].append(subs)
+        return self
+
+    def group(self, group_id):
+        self.groups.append(group_id)
+        return self
+
+    def exclude(self, exclusions):
+        self.excluded_rooms.update(exclusions)
+        return self
+
+    def allow(self, allowed):
+        self.allowed_rooms.update(allowed)
+        return self
+
+    def affix(self):
+        self.static = True
+        self.killable = False
+        self.can_drop = False
+        return self
+
+    def stasis(self):
+        self.can_randomize = False
+        return self
+
+    def exalt(self):
+        self.boss = True
+        self.static = True  # not randomized by sprite sheet
+        return self
+
+    def immune(self):
+        self.killable = False
+        self.can_drop = False
+        return self
+
+    def immerse(self):
+        self.water_only = True
+        return self
+
+    def skip(self):
+        self.dont_use = True
+        return self
+
+    def ow_skip(self):
+        self.ow_valid = False
+        return self
+
+    def uw_skip(self):
+        self.uw_valid = False
+        return self
+
+    def good_for_uw_water(self):
+        return self.water_only and not self.static and not self.dont_use and self.uw_valid
+
+    def good_for_shutter(self):
+        return self.killable and not self.static and not self.dont_use and self.uw_valid
+
+    def good_for_key_drop(self):
+        return self.good_for_shutter() and self.can_drop
+
+    def __str__(self):
+        return f'Req for {enemy_names[self.sprite]}'
+
+
+NoFlyingRooms = {0xd2, 0x10c}  # Mire 2, Mimic Cave
+NoBeamosOrTrapRooms = {0xb, 0x16, 0x19, 0x1e, 0x26, 0x27, 0x36, 0x3f, 0x40, 0x42, 0x46, 0x49, 0x4b, 0x4e, 0x55, 0x57,
+                       0x5f, 0x65, 0x6a, 0x74, 0x76, 0x7d, 0x7f, 0x83, 0x84, 0x85, 0x8c, 0x8d, 0x92, 0x95, 0x98, 0x9b,
+                       0x9c, 0x9d, 0x9e, 0xa0, 0xaa, 0xaf, 0xb3, 0xba, 0xbb, 0xbc, 0xc6, 0xcb, 0xce, 0xd0, 0xd2, 0xd5,
+                       0xd8, 0xdc, 0xdf, 0xe4, 0xe7, 0xee, 0xf9, 0xfd, 0x10c}
+LenientTrapsForTesting = {0x16, 0x26, 0x3f, 0x40, 0x42, 0x46, 0x49, 0x4e, 0x57,
+                          0x65, 0x6a, 0x74, 0x76, 0x7d, 0x98,
+                          0x9e, 0xaf, 0xba, 0xc6, 0xcb, 0xce, 0xd2, 0xd5,
+                          0xd8, 0xdf, 0xe4, 0xe7, 0xee, 0xfd, 0x10c}
+# this will have to be dynamic if cave rooms are allowed in dungeons
+WallmasterValidRooms = {
+    HC_NorthCorridor, HC_SwitchRoom, HoulihanRoom, TR_CrystalRollerRoom,
+    PalaceofDarkness0x09, PoD_StalfosTrapRoom, PoD_TurtleRoom, GT_EntranceRoom, Ice_EntranceRoom,
+    GanonEvacuationRoute, HC_BombableStockRoom, Sanctuary, TR_Hokku_BokkuKeyRoom2, TR_BigKeyRoom, TurtleRock0x15,
+    Swamp_SwimmingTreadmill, Hera_MoldormFallRoom, PoD_DarkMaze, PoD_BigChestRoom, PoD_Mimics_MovingWallRoom,
+    GT_IceArmos, GT_FinalHallway, Ice_BombFloor_BariRoom, Ice_Pengator_BigKeyRoom, Tower_Agahnim, HC_KeyRatRoom,
+    HC_SewerTextTriggerRoom, TR_WestExittoBalcony, TR_DoubleHokku_Bokku_BigchestRoom, Swamp_StatueRoom, Hera_BigChest,
+    Swamp_EntranceRoom, Skull_Mothula, PoD_BigHubRoom, PoD_MapChest_FairyRoom, Ice_CompassRoom, Hera_HardhatBeetlesRoom,
+    HC_SewerKeyChestRoom, Desert_Lanmolas, Swamp_PushBlockPuzzle_Pre_BigKeyRoom, Swamp_BigKey_BSRoom,
+    Swamp_BigChestRoom, Swamp_MapChest_WaterFillRoom, Swamp_KeyPotRoom, Skull_GibdoKey_MothulaHoleRoom,
+    PoD_BombableFloorRoom, PoD_SpikeBlock_ConveyorRoom, GT_TorchRoom2, Ice_StalfosKnights_ConveyorHellway,
+    Ice_MapChestRoom, Tower_FinalBridgeRoom, HC_FirstDarkRoom, HC_6RopesRoom, Desert_TorchPuzzle_MovingWallRoom,
+    TT_BigChestRoom, TT_JailCellsRoom, Swamp_CompassChestRoom, Skull_GibdoTorchPuzzleRoom, PoD_EntranceRoom,
+    PoD_Warps_SouthMimicsRoom, GT_Mini_HelmasaurConveyorRoom, GT_MoldormRoom, Ice_Bomb_JumpRoom,
+    IcePalaceCloneRoom_FairyRoom, HC_WestCorridor, HC_ThroneRoom, HC_EastCorridor, Desert_Popos2_BeamosHellwayRoom,
+    Swamp_UpstairsPitsRoom, CastleSecretEntrance_UncleDeathRoom, Skull_KeyPot_TrapRoom, Skull_BigKeyRoom,
+    Skull_BigChestRoom, Skull_FinalSectionEntranceRoom, PoD_HelmasaurKing, GT_SpikePitRoom, GT_Ganon_BallZ,
+    GT_Gauntlet1_2_3, Ice_LonelyFirebar, Ice_HiddenChest_SpikeFloorRoom, HC_WestEntranceRoom, HC_MainEntranceRoom,
+    HC_EastEntranceRoom, Desert_FinalSectionEntranceRoom, TT_WestAtticRoom, TT_EastAtticRoom,
+    Swamp_HiddenChest_HiddenDoorRoom, Skull_CompassChestRoom, Skull_KeyChest_TrapRoom, PoD_RupeeRoom, GT_MimicsRooms,
+    GT_LanmolasRoom, GT_Gauntlet4_5, Ice_PengatorsRoom, HC_SmallCorridortoJailCells, HC_BoomerangChestRoom,
+    HC_MapChestRoom, Desert_BigChestRoom, Desert_MapChestRoom, Desert_BigKeyChestRoom, Swamp_WaterDrainRoom,
+    Hera_EntranceRoom, GanonsTower, GT_EastSideCollapsingBridge_ExplodingWallRoom, GT_Winder_WarpMazeRoom,
+    Ice_HiddenChest_BombableFloorRoom, Ice_BigSpikeTrapsRoom, HC_JailCellRoom, HC_NextToChasmRoom, HC_BasementChasmRoom,
+    Desert_WestEntranceRoom, Desert_MainEntranceRoom, Desert_EastEntranceRoom, Hera_TileRoom, Eastern_FairyRoom,
+    GT_BlockPuzzle_SpikeSkip_MapChestRoom, GT_EastandWestDownstairs_BigChestRoom, GT_Tile_TorchPuzzleRoom,
+    IcePalace0x8E, Mire_Vitreous, Mire_FinalSwitchRoom, Mire_DarkBombWall_SwitchesRoom,
+    Mire_DarkCaneFloorSwitchPuzzleRoom, GT_FinalCollapsingBridgeRoom, GT_Torches1Room, Mire_TorchPuzzle_MovingWallRoom,
+    Mire_EntranceRoom, Eastern_EyegoreKeyRoom, GT_ManySpikes_WarpMazeRoom, GT_InvisibleFloorMazeRoom,
+    GT_CompassChest_InvisibleFloorRoom, Ice_BigChestRoom, IcePalace0x9F, Mire_Pre_VitreousRoom, Mire_FishRoom,
+    Mire_BridgeKeyChestRoom, MiseryMire0xA3, TR_Trinexx, GT_WizzrobesRooms, GT_MoldormFallRoom, Hera_FairyRoom,
+    Eastern_StalfosSpawnRoom, Eastern_BigChestRoom, Eastern_MapChestRoom, TT_MovingSpikes_KeyPotRoom, TT_BlindTheThief,
+    IcePalace0xAE, Ice_IceBridgeRoom, Tower_CircleofPots, Mire_HourglassRoom, Mire_SlugRoom, Mire_SpikeKeyChestRoom,
+    TR_Pre_TrinexxRoom, TR_DarkMaze, TR_ChainChompsRoom, TR_MapChest_KeyChest_RollerRoom, Eastern_BigKeyRoom,
+    Eastern_LobbyCannonballsRoom, Eastern_DarkAntifairy_KeyPotRoom, TT_Hellway, TT_ConveyorToilet, Ice_BlockPuzzleRoom,
+    IcePalaceCloneRoom_SwitchRoom, Tower_DarkBridgeRoom, Mire_CompassChest_TileRoom, Mire_BigHubRoom, Mire_BigChestRoom,
+    TR_FinalCrystalSwitchPuzzleRoom, TR_LaserBridge, TurtleRock0xC6, TR_TorchPuzzle,
+    Eastern_EntranceRoom, UnknownRoom, TT_NorthWestEntranceRoom, TT_NorthEastEntranceRoom, Ice_HoletoKholdstareRoom,
+    Tower_DarkMaze, Mire_ConveyorSlug_BigKeyRoom, Mire_Mire02_WizzrobesRoom, TR_LaserKeyRoom, TR_EntranceRoom,
+    Eastern_PreArmosKnightsRoom, Eastern_CanonballRoom, EasternPalace, TT_Main_SouthWestEntranceRoom,
+    TT_SouthEastEntranceRoom, Tower_EntranceRoom
+}
+
+
+def init_sprite_requirements():
+    reqs = [
+        SpriteRequirement(EnemySprite.Raven).no_drop().sub_group(3, [0x11, 0x19]).exclude(NoFlyingRooms),
+        SpriteRequirement(EnemySprite.Vulture).no_drop().sub_group(2, 0x12).exclude(NoFlyingRooms),
+        SpriteRequirement(EnemySprite.CorrectPullSwitch).affix().sub_group(3, [0x52, 0x53]),
+        SpriteRequirement(EnemySprite.WrongPullSwitch).affix().sub_group(3, [0x52, 0x53]),
+        SpriteRequirement(EnemySprite.Octorok).sub_group(2, [0xc, 0x18]),
+        SpriteRequirement(EnemySprite.Moldorm).exalt().sub_group(2, 0x30),
+        SpriteRequirement(EnemySprite.Octorok4Way).sub_group(2, 0xc),
+        SpriteRequirement(EnemySprite.Cucco).immune().sub_group(3, [0x15, 0x50]).exclude(NoFlyingRooms),
+        # todo: Buzzblob kill rule for mimics
+        SpriteRequirement(EnemySprite.Buzzblob).sub_group(3, 0x11),
+        SpriteRequirement(EnemySprite.Snapdragon).sub_group(0, 0x16).sub_group(2, 0x17),
+        SpriteRequirement(EnemySprite.Octoballoon).no_drop().sub_group(2, 0xc).exclude(NoFlyingRooms),
+        SpriteRequirement(EnemySprite.Hinox).sub_group(0, 0x16),
+        SpriteRequirement(EnemySprite.Moblin).sub_group(2, 0x17),
+        SpriteRequirement(EnemySprite.MiniHelmasaur).sub_group(1, 0x1e),
+        # todo: antifairy kill rule
+        SpriteRequirement(EnemySprite.AntiFairy).no_drop().sub_group(3, [0x52, 0x53])
+        .exclude(NoFlyingRooms).exclude({0x40}),  # no anti-fairies in aga tower bridge room
+        SpriteRequirement(EnemySprite.Wiseman).affix().sub_group(2, 0x4c),
+        SpriteRequirement(EnemySprite.Hoarder).no_drop().sub_group(3, 0x11).exclude({0x10c}),
+        SpriteRequirement(EnemySprite.MiniMoldorm).sub_group(1, 0x1e),
+        SpriteRequirement(EnemySprite.Poe).no_drop().sub_group(3, 0x15).exclude(NoFlyingRooms),
+        SpriteRequirement(EnemySprite.Smithy).affix().sub_group(1, 0x1d).sub_group(3, 0x15),
+        SpriteRequirement(EnemySprite.Statue).affix().sub_group(3, [0x52, 0x53]),
+        SpriteRequirement(EnemySprite.CrystalSwitch).affix().sub_group(3, [0x52, 0x53]),
+        SpriteRequirement(EnemySprite.SickKid).affix().sub_group(0, 0x51),
+        SpriteRequirement(EnemySprite.Sluggula).sub_group(2, 0x25),
+        SpriteRequirement(EnemySprite.WaterSwitch).affix().sub_group(3, 0x53),
+        SpriteRequirement(EnemySprite.Ropa).sub_group(0, 0x16),
+        SpriteRequirement(EnemySprite.RedBari).no_drop().sub_group(0, 0x1f),
+        SpriteRequirement(EnemySprite.BlueBari).sub_group(0, 0x1f),
+        # todo: don't randomize red/blue bari in room 0x7F
+        SpriteRequirement(EnemySprite.TalkingTree).affix().sub_group(0, 0x15),
+        SpriteRequirement(EnemySprite.HardhatBeetle).sub_group(1, 0x1e),
+        # todo: deadrock kill rule for mimics (not sure why ice spike room...)
+        SpriteRequirement(EnemySprite.Deadrock).sub_group(3, 0x10).exclude({0x7f, 0x10c}),
+        SpriteRequirement(EnemySprite.DarkWorldHintNpc).affix(),   # no groups?
+        SpriteRequirement(EnemySprite.AdultNpc).affix().sub_group(0, [0xe, 0x4f]),
+        SpriteRequirement(EnemySprite.SweepingLady).affix().group(6),  # no sub groups?
+        SpriteRequirement(EnemySprite.Lumberjacks).affix().sub_group(2, 0x4a),
+        SpriteRequirement(EnemySprite.RaceGameLady).affix().group(6),
+        SpriteRequirement(EnemySprite.FortuneTeller).affix().sub_group(0, 0x4b),
+        SpriteRequirement(EnemySprite.ArgueBros).affix().sub_group(0, 0x4f),
+        SpriteRequirement(EnemySprite.RupeePull).affix(),
+        SpriteRequirement(EnemySprite.YoungSnitch).affix().group(6),
+        SpriteRequirement(EnemySprite.Innkeeper).affix(),   # no groups?
+        SpriteRequirement(EnemySprite.Witch).affix().sub_group(2, 0x7c),
+        SpriteRequirement(EnemySprite.Waterfall).affix(),
+        SpriteRequirement(EnemySprite.EyeStatue).affix(),
+        SpriteRequirement(EnemySprite.Locksmith).affix().sub_group(3, 0x11),
+        SpriteRequirement(EnemySprite.MagicBat).affix().sub_group(3, 0x1d),
+        SpriteRequirement(EnemySprite.KidInKak).affix().group(6),
+        SpriteRequirement(EnemySprite.OldSnitch).affix().group(6),
+        SpriteRequirement(EnemySprite.Hoarder2).no_drop().sub_group(3, 0x11).exclude({0x10c}),
+        SpriteRequirement(EnemySprite.TutorialGuard).affix(),
+        SpriteRequirement(EnemySprite.LightningGate).affix().sub_group(3, 0x3f),
+        SpriteRequirement(EnemySprite.BlueGuard).sub_group(1, [0xd, 0x49]),
+        SpriteRequirement(EnemySprite.GreenGuard).sub_group(1, 0x49),
+        SpriteRequirement(EnemySprite.RedSpearGuard).sub_group(1, [0xd, 0x49]),
+        SpriteRequirement(EnemySprite.BluesainBolt).sub_group(0, 0x46).sub_group(1, [0xd, 0x49]),
+        SpriteRequirement(EnemySprite.UsainBolt).sub_group(1, [0xd, 0x49]),
+        SpriteRequirement(EnemySprite.BlueArcher).sub_group(0, 0x48).sub_group(1, 0x49),
+        SpriteRequirement(EnemySprite.GreenBushGuard).sub_group(0, 0x48).sub_group(1, 0x49),
+        SpriteRequirement(EnemySprite.RedJavelinGuard).sub_group(0, 0x46).sub_group(1, 0x49),
+        SpriteRequirement(EnemySprite.RedBushGuard).sub_group(0, 0x46).sub_group(1, 0x49),
+        SpriteRequirement(EnemySprite.BombGuard).sub_group(0, 0x46).sub_group(1, 0x49),
+        SpriteRequirement(EnemySprite.GreenKnifeGuard).sub_group(1, 0x49).sub_group(2, 0x13),
+        SpriteRequirement(EnemySprite.Geldman).no_drop().sub_group(2, 0x12).exclude({0x10c}),
+        SpriteRequirement(EnemySprite.Toppo).no_drop().sub_group(3, 0x11),
+        SpriteRequirement(EnemySprite.Popo).sub_group(1, 0x2c),
+        SpriteRequirement(EnemySprite.Popo2).sub_group(1, 0x2c),
+        SpriteRequirement(EnemySprite.Popo2).sub_group(1, 0x2c),
+        SpriteRequirement(EnemySprite.ArmosStatue).sub_group(3, 0x10).exclude({0x10c}),
+        SpriteRequirement(EnemySprite.KingZora).affix().sub_group(3, 0x44),
+        SpriteRequirement(EnemySprite.ArmosKnight).exalt().sub_group(3, 0x1d),
+        SpriteRequirement(EnemySprite.Lanmolas).exalt().sub_group(3, 0x31),
+        SpriteRequirement(EnemySprite.FireballZora).immerse().uw_skip().sub_group(2, [0xc, 0x18]),
+        SpriteRequirement(EnemySprite.Zora).immerse().no_drop().uw_skip().sub_group(2, 0xc).sub_group(3, 0x44),
+        SpriteRequirement(EnemySprite.DesertStatue).affix().sub_group(2, 0x12),
+        SpriteRequirement(EnemySprite.Crab).sub_group(2, 0xc),
+        SpriteRequirement(EnemySprite.LostWoodsBird).affix().sub_group(2, 0x37).sub_group(3, 0x36),
+        SpriteRequirement(EnemySprite.LostWoodsSquirrel).affix().sub_group(2, 0x37).sub_group(3, 0x36),
+        SpriteRequirement(EnemySprite.SparkCW).immune().sub_group(0, 0x1f),
+        SpriteRequirement(EnemySprite.SparkCCW).immune().sub_group(0, 0x1f),
+        SpriteRequirement(EnemySprite.RollerVerticalUp).immune().sub_group(2, 0x27).exclude(NoBeamosOrTrapRooms),
+        SpriteRequirement(EnemySprite.RollerVerticalDown).immune().sub_group(2, 0x27).exclude(NoBeamosOrTrapRooms),
+        SpriteRequirement(EnemySprite.RollerHorizontalLeft).immune().sub_group(2, 0x27).exclude(NoBeamosOrTrapRooms),
+        SpriteRequirement(EnemySprite.RollerHorizontalRight).immune().sub_group(2, 0x27).exclude(NoBeamosOrTrapRooms),
+        SpriteRequirement(EnemySprite.Beamos).immune().sub_group(1, 0x2c).exclude(NoBeamosOrTrapRooms),
+        SpriteRequirement(EnemySprite.MasterSword).affix().sub_group(2, 0x37).sub_group(3, 0x36),
+        # these are excluded for now
+        SpriteRequirement(EnemySprite.DebirandoPit).skip().sub_group(0, 0x2f),
+        SpriteRequirement(EnemySprite.Debirando).skip().sub_group(0, 0x2f),
+        SpriteRequirement(EnemySprite.ArcheryNpc).affix().sub_group(0, 0x4b),
+        SpriteRequirement(EnemySprite.WallCannonVertLeft).affix().sub_group(0, 0x2f),
+        SpriteRequirement(EnemySprite.WallCannonVertRight).affix().sub_group(0, 0x2f),
+        SpriteRequirement(EnemySprite.WallCannonHorzTop).affix().sub_group(0, 0x2f),
+        SpriteRequirement(EnemySprite.WallCannonHorzBottom).affix().sub_group(0, 0x2f),
+        SpriteRequirement(EnemySprite.BallNChain).sub_group(0, 0x46).sub_group(1, 0x49),
+        SpriteRequirement(EnemySprite.CannonTrooper).sub_group(0, 0x46).sub_group(1, 0x49),
+        SpriteRequirement(EnemySprite.CricketRat).sub_group(2, [0x1c, 0x24]),
+        SpriteRequirement(EnemySprite.Snake).sub_group(2, [0x1c, 0x24]),
+        SpriteRequirement(EnemySprite.Keese).no_drop().sub_group(2, [0x1c, 0x24]),
+        SpriteRequirement(EnemySprite.Leever).no_drop().sub_group(0, 0x2f),
+        SpriteRequirement(EnemySprite.FairyPondTrigger).affix().sub_group(3, 0x36),
+        SpriteRequirement(EnemySprite.UnclePriest).affix().sub_group(0, [0x47, 0x51]),
+        SpriteRequirement(EnemySprite.RunningNpc).affix().group(6),
+        SpriteRequirement(EnemySprite.BottleMerchant).affix().group(6),
+        SpriteRequirement(EnemySprite.Zelda).affix(),
+        SpriteRequirement(EnemySprite.Grandma).affix().sub_group(0, 0x4b).sub_group(1, 0x4d).sub_group(2, 0x4a),
+        SpriteRequirement(EnemySprite.Agahnim).exalt().sub_group(0, 0x55).sub_group(1, [0x1a, 0x3d]).sub_group(2, 0x42)
+        .sub_group(3, 0x43),
+        SpriteRequirement(EnemySprite.FloatingSkull).no_drop().sub_group(0, 0x1f).exclude(NoFlyingRooms),
+        SpriteRequirement(EnemySprite.FirebarCW).immune().sub_group(0, 0x1f),
+        SpriteRequirement(EnemySprite.FirebarCCW).immune().sub_group(0, 0x1f),
+        # todo: don't randomize these in GT Torch Cross and TR Dark Ride? was that ever implemented?
+        SpriteRequirement(EnemySprite.Firesnake).immune().sub_group(0, 0x1f),
+        SpriteRequirement(EnemySprite.Hover).immerse().sub_group(2, 0x22).exclude(NoFlyingRooms),
+        # todo: leave them in swamp palace entrance...
+        SpriteRequirement(EnemySprite.AntiFairyCircle).skip().no_drop().sub_group(3, [0x52, 0x53]),
+        SpriteRequirement(EnemySprite.GreenEyegoreMimic).sub_group(2, 0x2e),
+        SpriteRequirement(EnemySprite.RedEyegoreMimic).sub_group(2, 0x2e),
+        # kodongos apparently broken?
+        SpriteRequirement(EnemySprite.Kondongo).skip().sub_group(2, 0x2a),
+        SpriteRequirement(EnemySprite.Mothula).exalt().sub_group(2, 0x38).sub_group(3, 0x52),
+        SpriteRequirement(EnemySprite.SpikeBlock).immune().sub_group(3, [0x52, 0x53]).exclude(NoBeamosOrTrapRooms)
+        .exclude({0x28}),  # why exclude sp entrance?
+        SpriteRequirement(EnemySprite.Gibdo).sub_group(2, 0x23),
+        SpriteRequirement(EnemySprite.Arrghus).exalt().sub_group(2, 0x39),
+        SpriteRequirement(EnemySprite.Arrghi).exalt().sub_group(2, 0x39),
+        SpriteRequirement(EnemySprite.Terrorpin).sub_group(2, 0x2a).exclude({0x10c}),  # probably fine in mimic now
+        SpriteRequirement(EnemySprite.Blob).sub_group(1, 0x20),
+        # todo: wallmaster overlords
+        SpriteRequirement(EnemySprite.Wallmaster).immune().ow_skip().sub_group(2, 0x23)
+        .allow(WallmasterValidRooms),
+        SpriteRequirement(EnemySprite.StalfosKnight).sub_group(1, 0x10).exclude({0x10c}),
+        SpriteRequirement(EnemySprite.HelmasaurKing).exalt().sub_group(2, 0x3a).sub_group(3, 0x3e),
+        SpriteRequirement(EnemySprite.Bumper).affix().sub_group(3, [0x52, 0x53]),
+        SpriteRequirement(EnemySprite.LaserEyeLeft).affix().sub_group(3, [0x52, 0x53]),
+        SpriteRequirement(EnemySprite.LaserEyeRight).affix().sub_group(3, [0x52, 0x53]),
+        SpriteRequirement(EnemySprite.LaserEyeTop).affix().sub_group(3, [0x52, 0x53]),
+        SpriteRequirement(EnemySprite.LaserEyeBottom).affix().sub_group(3, [0x52, 0x53]),
+        SpriteRequirement(EnemySprite.Pengator).sub_group(2, 0x26),
+        SpriteRequirement(EnemySprite.Kyameron).no_drop().immerse().sub_group(2, 0x22),
+        # todo: leave them in swamp palace entrance...
+        SpriteRequirement(EnemySprite.Wizzrobe).sub_group(2, [0x25, 0x29]),
+        SpriteRequirement(EnemySprite.Zoro).no_drop().sub_group(1, 0x20),
+        SpriteRequirement(EnemySprite.Babasu).no_drop().sub_group(1, 0x20),
+        SpriteRequirement(EnemySprite.GroveOstritch).affix().sub_group(2, 0x4e),
+        SpriteRequirement(EnemySprite.GroveRabbit).affix(),
+        SpriteRequirement(EnemySprite.GroveBird).affix().sub_group(2, 0x4e),
+        SpriteRequirement(EnemySprite.Freezor).stasis().skip().sub_group(2, 0x26),
+        SpriteRequirement(EnemySprite.Kholdstare).exalt().sub_group(2, 0x3c),
+        SpriteRequirement(EnemySprite.KholdstareShell).exalt(),
+        SpriteRequirement(EnemySprite.FallingIce).exalt().sub_group(2, 0x3c),
+        SpriteRequirement(EnemySprite.BlueZazak).sub_group(2, 0x28),
+        SpriteRequirement(EnemySprite.RedZazak).sub_group(2, 0x28),
+        SpriteRequirement(EnemySprite.Stalfos).sub_group(0, 0x1f),
+        SpriteRequirement(EnemySprite.GreenZirro).no_drop().sub_group(3, 0x1b).exclude(NoFlyingRooms),
+        SpriteRequirement(EnemySprite.BlueZirro).no_drop().sub_group(3, 0x1b).exclude(NoFlyingRooms),
+        SpriteRequirement(EnemySprite.Pikit).no_drop().sub_group(3, 0x1b),
+        SpriteRequirement(EnemySprite.CrystalMaiden).affix(),
+        SpriteRequirement(EnemySprite.OldMan).affix().sub_group(0, 0x46).sub_group(1, 0x49).sub_group(2, 0x1c),
+        SpriteRequirement(EnemySprite.PipeDown).affix(),
+        SpriteRequirement(EnemySprite.PipeUp).affix(),
+        SpriteRequirement(EnemySprite.PipeRight).affix(),
+        SpriteRequirement(EnemySprite.PipeLeft).affix(),
+        SpriteRequirement(EnemySprite.GoodBee).affix().sub_group(0, 0x1f),
+        SpriteRequirement(EnemySprite.PurpleChest).affix().sub_group(3, 0x15),
+        SpriteRequirement(EnemySprite.BombShopGuy).affix().sub_group(1, 0x4d),
+        SpriteRequirement(EnemySprite.Kiki).affix().sub_group(3, 0x19),
+        SpriteRequirement(EnemySprite.BlindMaiden).affix(),
+        #     dialog tester.sub_group(1, 0x2c)
+        SpriteRequirement(EnemySprite.BullyPinkBall).affix().sub_group(3, 0x14),
+        # shop keepers in complex thing below
+        SpriteRequirement(EnemySprite.Drunkard).affix().sub_group(0, 0x4f).sub_group(1, 0x4d).sub_group(2, 0x4a).
+        sub_group(3, 0x50),
+        SpriteRequirement(EnemySprite.Vitreous).exalt().sub_group(3, 0x3d),
+        SpriteRequirement(EnemySprite.Catfish).affix().sub_group(2, 0x18),
+        SpriteRequirement(EnemySprite.CutsceneAgahnim).affix().sub_group(0, 0x55).sub_group(1, 0x3d)
+        .sub_group(2, 0x42).sub_group(3, 0x43),
+        SpriteRequirement(EnemySprite.Boulder).affix().sub_group(3, 0x10),
+        SpriteRequirement(EnemySprite.Gibo).sub_group(2, 0x28),
+        SpriteRequirement(EnemySprite.Thief).no_drop().sub_group(0, [0xe, 0x15]),
+        SpriteRequirement(EnemySprite.Medusa).affix(),
+        SpriteRequirement(EnemySprite.FourWayShooter).affix(),
+        SpriteRequirement(EnemySprite.Pokey).sub_group(2, 0x27),
+        SpriteRequirement(EnemySprite.BigFairy).affix().sub_group(2, 0x39).sub_group(3, 0x36),
+        SpriteRequirement(EnemySprite.Tektite).sub_group(3, 0x10),
+        SpriteRequirement(EnemySprite.Chainchomp).immune().sub_group(2, 0x27),
+        SpriteRequirement(EnemySprite.TrinexxRockHead).exalt().sub_group(0, 0x40).sub_group(3, 0x3f),
+        SpriteRequirement(EnemySprite.TrinexxFireHead).exalt().sub_group(0, 0x40).sub_group(3, 0x3f),
+        SpriteRequirement(EnemySprite.TrinexxIceHead).exalt().sub_group(0, 0x40).sub_group(3, 0x3f),
+        SpriteRequirement(EnemySprite.Blind).exalt().sub_group(1, 0x2c).sub_group(2, 0x3b),
+        SpriteRequirement(EnemySprite.Swamola).immerse().no_drop().sub_group(3, 0x19),
+        SpriteRequirement(EnemySprite.Lynel).sub_group(3, 0x14),
+        SpriteRequirement(EnemySprite.BunnyBeam).affix(),
+        SpriteRequirement(EnemySprite.FloppingFish).uw_skip().immune(),
+        SpriteRequirement(EnemySprite.Stal).skip(),
+        SpriteRequirement(EnemySprite.DiggingGameNPC).affix().sub_group(1, 0x2a),
+        SpriteRequirement(EnemySprite.Ganon).exalt().sub_group(0, 0x21).sub_group(1, 0x41)
+        .sub_group(2, 0x45).sub_group(3, 0x33),
+        SpriteRequirement(EnemySprite.Faerie).affix(),
+        SpriteRequirement(EnemySprite.FakeMasterSword).immune().sub_group(3, 0x11),
+        SpriteRequirement(EnemySprite.MagicShopAssistant).affix().sub_group(0, 0x4b).sub_group(3, 0x5a),
+        SpriteRequirement(EnemySprite.SomariaPlatform).affix().sub_group(2, 0x27),
+        SpriteRequirement(EnemySprite.CastleMantle).affix().sub_group(0, 0x5d),
+        SpriteRequirement(EnemySprite.MedallionTablet).affix().sub_group(2, 0x12),
+
+        # todo: overlord requirements
+        SpriteRequirement(2, 7).affix().sub_group(2, 46),
+        SpriteRequirement(3, 7).affix().sub_group(2, 46),
+        SpriteRequirement(5, 7).affix().sub_group(0, 31),
+        SpriteRequirement(6, 7).affix().sub_group(2, [28, 36]),
+        SpriteRequirement(7, 7).affix(),
+        SpriteRequirement(8, 7).affix().sub_group(1, 32),
+        SpriteRequirement(9, 7).affix().sub_group(2, 35),
+        SpriteRequirement(0xa, 7).affix().sub_group(3, 82),
+        SpriteRequirement(0xb, 7).affix().sub_group(3, 82),
+        SpriteRequirement(0x10, 7).affix().sub_group(2, 34),
+        SpriteRequirement(0x11, 7).affix().sub_group(2, 34),
+        SpriteRequirement(0x12, 7).affix().sub_group(2, 34),
+        SpriteRequirement(0x13, 7).affix().sub_group(2, 34),
+        SpriteRequirement(0x14, 7).affix(),
+        SpriteRequirement(0x15, 7).affix().sub_group(2, [37, 41]),
+        SpriteRequirement(0x16, 7).affix().sub_group(1, 32),
+        SpriteRequirement(0x17, 7).affix().sub_group(0, 31),
+        SpriteRequirement(0x18, 7).affix().sub_group(0, 31),
+        SpriteRequirement(0x19, 7).affix(),
+        SpriteRequirement(0x1a, 7).affix(),
+    ]
+    simple = {(r.sprite, r.overlord): r for r in reqs}
+    shopkeeper = [
+        SpriteRequirement(EnemySprite.Shopkeeper).affix().sub_group(0, 75).sub_group(2, 74).sub_group(3, 90)
+        .allow({0xff, 0x112, 0x11f}),
+        SpriteRequirement(EnemySprite.Shopkeeper).affix().sub_group(0, 75).sub_group(1, 77).sub_group(2, 74)
+        .sub_group(3, 90).allow({0x10f, 0x110, 0x11f}),
+        SpriteRequirement(EnemySprite.Shopkeeper).affix().sub_group(0, 79).sub_group(2, 74).sub_group(3, 90)
+        .allow({0x118}),
+        SpriteRequirement(EnemySprite.Shopkeeper).affix().sub_group(0, 14).sub_group(2, 74).sub_group(3, 90)
+        .allow({0x123, 0x124}),
+        SpriteRequirement(EnemySprite.Shopkeeper).affix().sub_group(0, 14).sub_group(2, 74).sub_group(3, 80)
+        .allow({0x125}),
+        SpriteRequirement(EnemySprite.Shopkeeper).affix().sub_group(0, 21).allow({0x11e}),
+    ]
+    complex_r = {}
+    for req in shopkeeper:
+        for r in req.allowed_rooms:
+            complex_r[r] = req
+    simple[(EnemySprite.Shopkeeper, 0)] = complex_r
+    return simple
+
+
+vanilla_sheets = [
+    (0x00, 0x49, 0x00, 0x00), (0x46, 0x49, 0x0C, 0x1D), (0x48, 0x49, 0x13, 0x1D), (0x46, 0x49, 0x13, 0x0E),
+    (0x48, 0x49, 0x0C, 0x11), (0x48, 0x49, 0x0C, 0x10), (0x4F, 0x49, 0x4A, 0x50), (0x0E, 0x49, 0x4A, 0x11),
+    (0x46, 0x49, 0x12, 0x00), (0x00, 0x49, 0x00, 0x50), (0x00, 0x49, 0x00, 0x11), (0x48, 0x49, 0x0C, 0x00),
+    (0x00, 0x00, 0x37, 0x36), (0x48, 0x49, 0x4C, 0x11), (0x5D, 0x2C, 0x0C, 0x44), (0x00, 0x00, 0x4E, 0x00),
+
+    (0x0F, 0x00, 0x12, 0x10), (0x00, 0x00, 0x00, 0x4C), (0x00, 0x0D, 0x17, 0x00), (0x16, 0x0D, 0x17, 0x1B),
+    (0x16, 0x0D, 0x17, 0x14), (0x15, 0x0D, 0x17, 0x15), (0x16, 0x0D, 0x18, 0x19), (0x16, 0x0D, 0x17, 0x19),
+    (0x16, 0x0D, 0x00, 0x00), (0x16, 0x0D, 0x18, 0x1B), (0x0F, 0x49, 0x4A, 0x11), (0x4B, 0x2A, 0x5C, 0x15),
+    (0x16, 0x49, 0x17, 0x1D), (0x00, 0x00, 0x00, 0x15), (0x16, 0x0D, 0x17, 0x10), (0x16, 0x49, 0x12, 0x00),
+
+    (0x16, 0x49, 0x0C, 0x11), (0x00, 0x00, 0x12, 0x10), (0x16, 0x0D, 0x00, 0x11), (0x16, 0x49, 0x0C, 0x00),
+    (0x16, 0x0D, 0x4C, 0x11), (0x0E, 0x0D, 0x4A, 0x11), (0x16, 0x1A, 0x17, 0x1B), (0x4F, 0x34, 0x4A, 0x50),
+    (0x35, 0x4D, 0x65, 0x36), (0x4A, 0x34, 0x4E, 0x00), (0x0E, 0x34, 0x4A, 0x11), (0x51, 0x34, 0x5D, 0x59),
+    (0x4B, 0x49, 0x4C, 0x11), (0x2D, 0x00, 0x00, 0x00), (0x5D, 0x00, 0x12, 0x59), (0x00, 0x00, 0x00, 0x00),
+
+    (0x00, 0x00, 0x00, 0x00), (0x00, 0x00, 0x00, 0x00), (0x00, 0x00, 0x00, 0x00), (0x00, 0x00, 0x00, 0x00),
+    (0x00, 0x00, 0x00, 0x00), (0x00, 0x00, 0x00, 0x00), (0x00, 0x00, 0x00, 0x00), (0x00, 0x00, 0x00, 0x00),
+    (0x00, 0x00, 0x00, 0x00), (0x00, 0x00, 0x00, 0x00), (0x00, 0x00, 0x00, 0x00), (0x00, 0x00, 0x00, 0x00),
+    (0x00, 0x00, 0x00, 0x00), (0x00, 0x00, 0x00, 0x00), (0x00, 0x00, 0x00, 0x00), (0x00, 0x00, 0x00, 0x00),
+
+    (0x47, 0x49, 0x2B, 0x2D), (0x46, 0x49, 0x1C, 0x52), (0x00, 0x49, 0x1C, 0x52), (0x5D, 0x49, 0x00, 0x52),
+    (0x46, 0x49, 0x13, 0x52), (0x4B, 0x4D, 0x4A, 0x5A), (0x47, 0x49, 0x1C, 0x52), (0x4B, 0x4D, 0x39, 0x36),
+    (0x1F, 0x2C, 0x2E, 0x52), (0x1F, 0x2C, 0x2E, 0x1D), (0x2F, 0x2C, 0x2E, 0x52), (0x2F, 0x2C, 0x2E, 0x31),
+    (0x1F, 0x1E, 0x30, 0x52), (0x51, 0x49, 0x13, 0x00), (0x4F, 0x49, 0x13, 0x50), (0x4F, 0x4D, 0x4A, 0x50),
+
+    (0x4B, 0x49, 0x4C, 0x2B), (0x1F, 0x20, 0x22, 0x53), (0x55, 0x3D, 0x42, 0x43), (0x1F, 0x1E, 0x23, 0x52),
+    (0x1F, 0x1E, 0x39, 0x3A), (0x1F, 0x1E, 0x3A, 0x3E), (0x1F, 0x1E, 0x3C, 0x3D), (0x40, 0x1E, 0x27, 0x3F),
+    (0x55, 0x1A, 0x42, 0x43), (0x1F, 0x1E, 0x2A, 0x52), (0x1F, 0x1E, 0x38, 0x52), (0x1F, 0x20, 0x28, 0x52),
+    (0x1F, 0x20, 0x26, 0x52), (0x1F, 0x2C, 0x25, 0x52), (0x1F, 0x20, 0x27, 0x52), (0x1F, 0x1E, 0x29, 0x52),
+
+    (0x1F, 0x2C, 0x3B, 0x52), (0x46, 0x49, 0x24, 0x52), (0x21, 0x41, 0x45, 0x33), (0x1F, 0x2C, 0x28, 0x31),
+    (0x1F, 0x0D, 0x29, 0x52), (0x1F, 0x1E, 0x27, 0x52), (0x1F, 0x20, 0x27, 0x53), (0x48, 0x49, 0x13, 0x52),
+    (0x0E, 0x1E, 0x4A, 0x50), (0x1F, 0x20, 0x26, 0x53), (0x15, 0x00, 0x00, 0x00), (0x1F, 0x00, 0x2A, 0x52),
+    (0x00, 0x00, 0x00, 0x00), (0x00, 0x00, 0x00, 0x00), (0x00, 0x00, 0x00, 0x00), (0x00, 0x00, 0x00, 0x00),
+    (0x00, 0x00, 0x00, 0x00), (0x00, 0x00, 0x00, 0x00), (0x00, 0x00, 0x00, 0x00), (0x00, 0x00, 0x00, 0x00),
+    (0x00, 0x00, 0x00, 0x00), (0x00, 0x00, 0x00, 0x00), (0x00, 0x00, 0x00, 0x00), (0x00, 0x00, 0x00, 0x00),
+    (0x00, 0x00, 0x00, 0x00), (0x00, 0x00, 0x00, 0x00), (0x00, 0x00, 0x00, 0x00), (0x00, 0x00, 0x00, 0x00),
+    (0x00, 0x00, 0x00, 0x00), (0x00, 0x00, 0x00, 0x08), (0x5D, 0x49, 0x00, 0x52), (0x55, 0x49, 0x42, 0x43),
+    (0x61, 0x62, 0x63, 0x50), (0x61, 0x62, 0x63, 0x50), (0x61, 0x62, 0x63, 0x50), (0x61, 0x62, 0x63, 0x50),
+    (0x61, 0x62, 0x63, 0x50), (0x61, 0x62, 0x63, 0x50), (0x61, 0x56, 0x57, 0x50), (0x61, 0x62, 0x63, 0x50),
+    (0x61, 0x62, 0x63, 0x50), (0x61, 0x56, 0x57, 0x50), (0x61, 0x56, 0x63, 0x50), (0x61, 0x56, 0x57, 0x50),
+    (0x61, 0x56, 0x33, 0x50), (0x61, 0x56, 0x57, 0x50), (0x61, 0x62, 0x63, 0x50), (0x61, 0x62, 0x63, 0x50)
+]
+
+required_boss_sheets = {EnemySprite.ArmosKnight: 9, EnemySprite.Lanmolas: 11, EnemySprite.Moldorm: 12,
+                        EnemySprite.HelmasaurKing: 21, EnemySprite.Arrghus: 20, EnemySprite.Mothula: 26,
+                        EnemySprite.Blind: 32, EnemySprite.Kholdstare: 22, EnemySprite.Vitreous: 22,
+                        EnemySprite.TrinexxRockHead: 23}
+
+
+class SpriteSheet:
+    def __init__(self, id, default_sub_groups):
+        self.id = id
+        self.sub_groups = list(default_sub_groups)
+        self.locked = [False] * 4
+        self.room_set = set()
+
+    def dungeon_id(self):
+        return self.id + 0x40
+
+    def valid_sprite(self, requirement):
+        if requirement.groups and self.id not in requirement.groups:
+            return False
+        for idx, sub in enumerate(self.sub_groups):
+            if requirement.sub_groups[idx] and sub not in requirement.sub_groups[idx]:
+                return False
+        return True
+
+    def lock_sprite_in(self, sprite):
+        for i, options in sprite.sub_groups.items():
+            self.locked[i] = len(options) > 0
+
+    def add_sprite_to_sheet(self, groups, rooms=None):
+        for idx, g in enumerate(groups):
+            if g is not None:
+                self.sub_groups[idx] = g
+                self.locked[idx] = True
+        if rooms is not None:
+            self.room_set.update(rooms)
+
+    def write_to_rom(self, rom, base_address):
+        rom.write_bytes(base_address + self.id * 4, self.sub_groups)
+
+    def __str__(self):
+        return f'{self.id} => [{", ".join([str(x) for x in self.sub_groups])}]'
+
+
+# convert to dungeon id
+def did(n):
+    return n + 0x40
+
+
+def init_sprite_sheets(requirements):
+    sheets = {id: SpriteSheet(id, def_sheet) for id, def_sheet in enumerate(vanilla_sheets)}
+    # wait until bosses are randomized to determine which are randomized
+    for sprite, sheet_num in required_boss_sheets.items():
+        sheet = sheets[did(sheet_num)]  # convert to dungeon sheet id
+        boss_sprite = requirements[(sprite, 0)]
+        sheet.lock_sprite_in(boss_sprite)
+    return sheets
+
+
+def setup_required_dungeon_groups(sheets):
+
+    sheets[did(1)].add_sprite_to_sheet([70, 73, 28, 82], {0xe4, 0xf0})  # old man
+    # various npcs
+    sheets[did(5)].add_sprite_to_sheet([75, 77, 74, 90], {0xf3, 0x109, 0x10e, 0x10f, 0x110, 0x111, 0x11a, 0x11c, 0x122})
+    sheets[did(7)].add_sprite_to_sheet([75, 77, 57, 54], {0x8, 0x2c, 0x114, 0x115})  # big fairies
+    sheets[did(13)].add_sprite_to_sheet([81, None, None, None], {0x55, 0x102, 0x104})  # uncle, sick kid
+    sheets[did(14)].add_sprite_to_sheet([71, 73, 76, 80], {0x12, 0x105, 0x10a})  # wisemen
+    sheets[did(15)].add_sprite_to_sheet([79, 77, 74, 80], {0xf4, 0xf5, 0x101, 0x103, 0x106, 0x118, 0x119})  # more npcs
+    sheets[did(18)].add_sprite_to_sheet([85, 61, 66, 67], {0x20, 0x30})  # aga alter, aga1
+    sheets[did(24)].add_sprite_to_sheet([85, 26, 66, 67], {0xd})  # aga2
+    sheets[did(34)].add_sprite_to_sheet([33, 65, 69, 51], {0})  # ganon
+    sheets[did(40)].add_sprite_to_sheet([14, None, 74, 80], {0x124, 0x125, 0x126})  # fairy + rupee npcs
+    sheets[did(9)].add_sprite_to_sheet([None, None, None, 29], {0xe3})  # magic bat
+    sheets[did(28)].add_sprite_to_sheet([None, None, 38, 82], {0xe, 0x7e, 0x8e, 0x9e})  # freezors
+    sheets[did(3)].add_sprite_to_sheet([93, None, None, None], {0x51})  # mantle
+    sheets[did(42)].add_sprite_to_sheet([21, None, None, None], {0x11e})  # hype cave
+    sheets[did(10)].add_sprite_to_sheet([47, None, 46, None], {0x5c, 0x75, 0xb9, 0xd9})  # cannonballs
+    sheets[did(37)].add_sprite_to_sheet([31, None, 39, 82], {0x24, 0xb4, 0xb5, 0xc6, 0xc7, 0xd6})  # somaria platforms
+    # not sure 31 is needed above
+
+    free_sheet_reqs = [
+        ([75, None, None, None], [0xff, 0x112, 0x11f]),  # shopkeepers
+        ([None, 77, None, 21], [0x121]),  # smithy
+        ([None, None, None, 80], [0x108]),  # chicken house
+        ([14, 30, None, None], [0x123]),  # mini moldorm (shutter door)
+        ([None, None, 34, None], [0x36, 0x46, 0x66, 0x76]),  # pirogusu spawners
+        ([None, 32, None, None], [0x3e, 0x9f]),  # babasu spawners
+        ([31, None, None, None], [0x7f]),  # force baris
+        ([None, None, 35, None], [0x39, 0x49, 0x56, 0x57, 0x68, 0x8d]),  # wallmasters
+        # bumpers - why the split - because of other requirements -
+        ([None, None, None, (82, 83)], [0x17, 0x2a, 0x4c, 0x59, 0x67, 0x68, 0x7e, 0x8b, 0xeb, 0xfb]),
+        # crystal switches - split for some reason
+        ([None, None, None, (82, 83)], [0xb, 0x13, 0x1b, 0x1e, 0x2a, 0x2b, 0x31, 0x3e, 0x5b, 0x6b, 0x77, 0xb7, 0x8b, 0x91, 0x92, 0x9b, 0x9d, 0xa1, 0xab, 0xb6, 0xbf, 0xc1, 0xc4, 0xef]),
+        # laser eyes - split for some reason
+        ([None, None, None, (82, 83)], [0x13, 0x23, 0x96, 0xa5, 0xc5, 0xd5]),
+        # statues - split for some reason
+        ([None, None, None, (82, 83)], [0x26, 0x2b, 0x40, 0x4a, 0x57, 0x6b, 0x7b]),
+
+        # non-optional
+        ([None, None, None, 82], [0x2, 0x58, 0x64, 0x8c, 0x10b]), # pull switches
+        ([None, None, None, 82], [0x1a, 0x3d, 0x44, 0x56, 0x5e, 0x7c, 0x95, 0xc3]),  # collasping bridges
+        ([None, None, None, 83], [0x4, 0x3f, 0xce]),  # pull tongue
+        ([None, None, None, 83], [0x35, 0x37, 0x76]),  # swamp drains
+        ([None, None, 34, None], [0x28]),  # tektike forced? - spawn chest
+        ([None, None, 37, None], [0x97]),  # wizzrobe spawner - in middle of room...
+    ]
+
+    # find home for the free_sheet_reqs
+    for pair in free_sheet_reqs:
+        groups, room_list = pair
+        possible_sheets = []
+        found_match = False
+        for num in range(65, 124):
+            sheet = sheets[num]
+            valid = True
+            match = True
+            for idx, value in enumerate(groups):
+                if value is not None and sheet.locked[idx]:
+                    valid = False
+                    if (sheet.sub_groups[idx] not in value if isinstance(value, tuple)
+                       else value != sheet.sub_groups[idx]):
+                        match = False
+                elif value is not None:
+                    match = False
+            if match:
+                found_match = True
+                break
+            if valid:
+                possible_sheets.append(sheet)
+        if not found_match:
+            chosen_sheet = random.choice(possible_sheets)
+            chosen_groups = [(random.choice(g) if isinstance(g, tuple) else g) for g in groups]
+            chosen_sheet.add_sprite_to_sheet(chosen_groups, room_list)
+
+
+# RandomizeRooms(optionFlags);
+    # roomCollection.LoadRooms()
+    # roomCollection.RandomizeRoomSpriteGroups(spriteGroupCollection, optionFlags);
+    # more stuff
+uw_sub_group_choices = {
+    0: [22, 31, 47, 14],  # 70, 72 for guards
+    1: [44, 30, 32],  # 73, 13
+    2: [12, 18, 23, 24, 28, 46, 34, 35, 39, 40, 38, 41, 36, 37, 42],
+    3: [17, 16, 27, 20, 82, 83]
+}
+
+
+def randomize_underworld_sprite_sheets(sheets):
+    setup_required_dungeon_groups(sheets)
+
+    for num in range(65, 124):  # sheets 0x41 to 0x7B inclusive
+        sheet = sheets[num]
+        if not sheet.locked[1] and num in [65, 66, 67, 68]:
+            sheet.locked[1] = True
+            sheet.sub_groups[1] = random.choice([13, 73])
+        for idx in range(0, 4):
+            if not sheet.locked[idx]:
+                sheet.sub_groups[idx] = random.choice(uw_sub_group_choices[idx])
+                # lock the group?
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
diff --git a/source/enemizer/__init__.py b/source/enemizer/__init__.py
new file mode 100644
index 00000000..724252e9
--- /dev/null
+++ b/source/enemizer/__init__.py
@@ -0,0 +1 @@
+# do nothing, just exist to make "source" package
diff --git a/source/item/FillUtil.py b/source/item/FillUtil.py
index 040497a2..82581a76 100644
--- a/source/item/FillUtil.py
+++ b/source/item/FillUtil.py
@@ -2,6 +2,7 @@ import RaceRandom as random
 import logging
 from collections import defaultdict
 
+from source.dungeon.EnemyList import enemy_stats
 from source.item.District import resolve_districts
 from BaseClasses import PotItem, PotFlags
 from DoorShuffle import validate_vanilla_reservation
@@ -421,19 +422,20 @@ def filter_locations(item_to_place, locations, world, vanilla_skip=False, potion
     return locations
 
 
-def filter_pot_locations(locations, world):
+
+
+def filter_special_locations(locations, world, vanilla_matcher):
     if world.algorithm == 'district':
         config = world.item_pool_config
         restricted = config.location_groups[0].locations
         filtered = [l for l in locations if l.name not in restricted or l.player not in restricted[l.name]]
         return filtered if len(filtered) > 0 else locations
     if world.algorithm == 'vanilla_fill':
-        filtered = [l for l in locations if l.pot and l.pot.item in [PotItem.Chicken, PotItem.BigMagic]]
+        filtered = [l for l in locations if vanilla_matcher(l)]
         return filtered if len(filtered) > 0 else locations
     return locations
 
 
-
 vanilla_mapping = {
     'Green Pendant': ['Eastern Palace - Prize'],
     'Red Pendant': ['Desert Palace - Prize', 'Tower of Hera - Prize'],
diff --git a/source/rom/DataTables.py b/source/rom/DataTables.py
new file mode 100644
index 00000000..b05b319c
--- /dev/null
+++ b/source/rom/DataTables.py
@@ -0,0 +1,45 @@
+from Utils import snes_to_pc
+
+from source.dungeon.EnemyList import EnemyTable, init_vanilla_sprites, vanilla_sprites
+from source.dungeon.RoomHeader import init_room_headers
+from source.dungeon.RoomList import Room0127
+from source.enemizer.SpriteSheets import init_sprite_sheets, init_sprite_requirements
+
+
+class DataTables:
+    def __init__(self):
+        self.room_headers = None
+        self.room_list = None  # todo: for boss rando
+        self.sprite_sheets = None
+        self.uw_enemy_table = None
+        self.ow_enemy_tables = None  # todo : data migration
+        self.pot_secret_table = None  # todo : migrate storage
+
+        # associated data
+        self.sprite_requirements = None
+
+    def write_to_rom(self, rom):
+        for header in self.room_headers.values():
+            header.write_to_rom(rom, snes_to_pc(0x30DA00))  # new header table, bank30, tables.asm
+        # room list
+        for sheet in self.sprite_sheets.values():
+            sheet.write_to_rom(snes_to_pc(0x00DB97))  # bank 00, SheetsTable_AA3
+        if self.uw_enemy_table.size() > 0x2800:
+            raise Exception('Sprite table is too big for current area')
+        self.uw_enemy_table.write_sprite_data_to_rom(rom)
+
+
+def init_data_tables(world, player):
+    data_tables = DataTables()
+    data_tables.room_headers = init_room_headers()
+    data_tables.room_list = {}
+    # if world.pottery[player] not in ['none']:
+    #     data_tables.room_list[0x0127] = Room0127
+    data_tables.sprite_requirements = init_sprite_requirements()
+    data_tables.sprite_sheets = init_sprite_sheets(data_tables.sprite_requirements)
+    init_vanilla_sprites()
+    uw_table = data_tables.uw_enemy_table = EnemyTable()
+    for room, sprite_list in vanilla_sprites.items():
+        for sprite in sprite_list:
+            uw_table.room_map[room].append(sprite.copy())
+    return data_tables
diff --git a/source/rom/__init__.py b/source/rom/__init__.py
new file mode 100644
index 00000000..724252e9
--- /dev/null
+++ b/source/rom/__init__.py
@@ -0,0 +1 @@
+# do nothing, just exist to make "source" package