diff --git a/DoorShuffle.py b/DoorShuffle.py
index 7568bba3..658b5e6b 100644
--- a/DoorShuffle.py
+++ b/DoorShuffle.py
@@ -158,6 +158,7 @@ def vanilla_key_logic(world, player):
                 world.key_logic[player] = {}
             analyze_dungeon(key_layout, world, player)
             world.key_logic[player][builder.name] = key_layout.key_logic
+            log_key_logic(builder.name, key_layout.key_logic)
             last_key = None
     if world.shuffle[player] == 'vanilla':
         validate_vanilla_key_logic(world, player)
@@ -1013,6 +1014,13 @@ def log_key_logic(d_name, key_logic):
             if rule.alternate_small_key is not None:
                 for loc in rule.alternate_big_key_loc:
                     logger.debug('---BK Loc %s', loc.name)
+        logger.debug('Placement rules for %s', d_name)
+        for rule in key_logic.placement_rules:
+            logger.debug('*Rule for %s:', rule.door_reference)
+            if rule.bk_conditional_set:
+                logger.debug('**BK Checks %s', ','.join([x.name for x in rule.bk_conditional_set]))
+                logger.debug('**BK Blocked By Door (%s) : %s', rule.needed_keys_wo_bk, ','.join([x.name for x in rule.check_locations_wo_bk]))
+            logger.debug('**BK Elsewhere (%s) : %s', rule.needed_keys_w_bk, ','.join([x.name for x in rule.check_locations_w_bk]))
 
 
 def build_pair_list(flat_list):
@@ -1105,6 +1113,7 @@ def ncr(n, r):
 
 def reassign_key_doors(builder, world, player):
     logger = logging.getLogger('')
+    logger.debug('Key doors for %s', builder.name)
     proposal = builder.key_door_proposal
     flat_proposal = flatten_pair_list(proposal)
     queue = deque(find_current_key_doors(builder))
diff --git a/Fill.py b/Fill.py
index b3d0948a..39a4d24e 100644
--- a/Fill.py
+++ b/Fill.py
@@ -201,7 +201,8 @@ def fill_restrictive(world, base_state, locations, itempool, single_player_place
                     else:
                         test_state = maximum_exploration_state
                     if (not single_player_placement or location.player == item_to_place.player)\
-                            and location.can_fill(test_state, item_to_place, perform_access_check):
+                            and location.can_fill(test_state, item_to_place, perform_access_check)\
+                            and valid_key_placement(item_to_place, location, itempool, world):
                         spot_to_fill = location
                         break
                     elif item_to_place.smallkey or item_to_place.bigkey:
@@ -217,11 +218,42 @@ def fill_restrictive(world, base_state, locations, itempool, single_player_place
                     raise FillError('No more spots to place %s' % item_to_place)
 
                 world.push_item(spot_to_fill, item_to_place, False)
+                track_outside_keys(item_to_place, spot_to_fill, world)
                 locations.remove(spot_to_fill)
                 spot_to_fill.event = True
 
     itempool.extend(unplaced_items)
 
+
+def valid_key_placement(item, location, itempool,  world):
+    if (not item.smallkey and not item.bigkey) or item.player != location.player or world.retro[item.player]:
+        return True
+    dungeon = location.parent_region.dungeon
+    if dungeon:
+        if dungeon.name not in item.name and (dungeon.name != 'Hyrule Castle' or 'Escape' not in item.name):
+            return True
+        key_logic = world.key_logic[item.player][dungeon.name]
+        unplaced_keys = len([x for x in itempool if x.name == key_logic.small_key_name])
+        return key_logic.check_placement(unplaced_keys)
+    else:
+        inside_dungeon_item = ((item.smallkey and not world.keyshuffle[item.player])
+                               or (item.bigkey and not world.bigkeyshuffle[item.player]))
+        return not inside_dungeon_item
+
+
+def track_outside_keys(item, location, world):
+    if not item.smallkey:
+        return
+    item_dungeon = item.name.split('(')[1][:-1]
+    if item_dungeon == 'Escape':
+        item_dungeon = 'Hyrule Castle'
+    if location.player == item.player:
+        loc_dungeon = location.parent_region.dungeon
+        if loc_dungeon and loc_dungeon.name == item_dungeon:
+            return  # this is an inside key
+    world.key_logic[item.player][item_dungeon].outside_keys += 1
+
+
 def distribute_items_restrictive(world, gftower_trash=False, fill_locations=None):
     # If not passed in, then get a shuffled list of locations to fill in
     if not fill_locations:
diff --git a/KeyDoorShuffle.py b/KeyDoorShuffle.py
index a3813b13..24b7dbb7 100644
--- a/KeyDoorShuffle.py
+++ b/KeyDoorShuffle.py
@@ -21,6 +21,7 @@ class KeyLayout(object):
         self.max_drops = None
         self.all_chest_locations = {}
         self.big_key_special = False
+        self.all_locations = set()
 
         # bk special?
         # bk required? True if big chests or big doors exists
@@ -44,6 +45,14 @@ class KeyLogic(object):
         self.bk_chests = set()
         self.logic_min = {}
         self.logic_max = {}
+        self.placement_rules = []
+        self.outside_keys = 0
+
+    def check_placement(self, unplaced_keys):
+        for rule in self.placement_rules:
+            if not rule.is_satisfiable(self.outside_keys, unplaced_keys):
+                return False
+        return True
 
 
 class DoorRules(object):
@@ -59,6 +68,38 @@ class DoorRules(object):
         self.small_location = None
 
 
+class PlacementRule(object):
+
+    def __init__(self):
+        self.door_reference = None
+        self.small_key = None
+        self.bk_conditional_set = None  # the location that means
+        self.needed_keys_w_bk = None
+        self.needed_keys_wo_bk = None
+        self.check_locations_w_bk = None
+        self.check_locations_wo_bk = None
+
+    def is_satisfiable(self, outside_keys, unplaced_keys):
+        bk_blocked = False
+        if self.bk_conditional_set:
+            for loc in self.bk_conditional_set:
+                if loc.item and loc.item.bigkey:
+                    bk_blocked = True
+                    break
+        available_keys = outside_keys
+        empty_chests = 0
+        check_locations = self.check_locations_wo_bk if bk_blocked else self.check_locations_w_bk
+        threshold = self.needed_keys_wo_bk if bk_blocked else self.needed_keys_w_bk
+        for loc in check_locations:
+            if not loc.item:
+                empty_chests += 1
+            elif loc.item and loc.item.name == self.small_key:
+                available_keys += 1
+        place_able_keys = min(empty_chests, unplaced_keys)
+        available_keys += place_able_keys
+        return available_keys >= threshold
+
+
 class KeyCounter(object):
 
     def __init__(self, max_chests):
@@ -108,6 +149,8 @@ def analyze_dungeon(key_layout, world, player):
 
     find_bk_locked_sections(key_layout, world)
     key_logic.bk_chests.update(find_big_chest_locations(key_layout.all_chest_locations))
+    if world.retro[player] and world.mode[player] != 'standard':
+        return
 
     original_key_counter = find_counter({}, False, key_layout)
     queue = deque([(None, original_key_counter)])
@@ -155,6 +198,7 @@ def analyze_dungeon(key_layout, world, player):
                 check_for_self_lock_key(rule, child, best_counter, key_layout, world, player)
                 bk_restricted_rules(rule, child, odd_counter, empty_flag, key_counter, key_layout, world, player)
                 key_logic.door_rules[child.name] = rule
+                create_placement_rule(key_layout, child, odd_counter, key_counter, world, player)
             doors_completed.add(child)
             next_counter = find_next_counter(child, key_counter, key_layout)
             ctr_id = cid(next_counter, key_layout)
@@ -177,6 +221,65 @@ def analyze_dungeon(key_layout, world, player):
             rule.small_key_num, rule.alternate_small_key = rule.alternate_small_key, rule.small_key_num
 
 
+def create_placement_rule(key_layout, door, odd_ctr, current_ctr, world, player):
+    key_logic = key_layout.key_logic
+    worst_ctr = find_worst_counter(door, odd_ctr, current_ctr, key_layout, False)
+    sm_num = worst_ctr.used_keys + 1
+    accessible_loc = set()
+    accessible_loc.update(worst_ctr.free_locations)
+    accessible_loc.update(worst_ctr.key_only_locations)
+    worst_ctr_wo_bk, post_ctr, alt_num = find_worst_counter_wo_bk(sm_num, accessible_loc, door, odd_ctr, current_ctr, key_layout)
+    blocked_loc = key_layout.all_locations.difference(accessible_loc)
+
+    if len(blocked_loc) > 0:
+        rule = PlacementRule()
+        rule.door_reference = door
+        rule.small_key = key_logic.small_key_name
+        rule.needed_keys_w_bk = sm_num
+        placement_self_lock_adjustment(rule, key_layout, blocked_loc, worst_ctr, world, player)
+        rule.check_locations_w_bk = accessible_loc
+        if worst_ctr_wo_bk:
+            accessible_wo_bk, post_set = set(), set()
+            accessible_wo_bk.update(worst_ctr_wo_bk.free_locations)
+            accessible_wo_bk.update(worst_ctr_wo_bk.key_only_locations)
+            post_set.update(post_ctr.free_locations)
+            post_set.update(post_ctr.key_only_locations)
+            blocked_wo_bk = post_set.difference(accessible_wo_bk)
+            if len(blocked_wo_bk) > 0:
+                rule.bk_conditional_set = blocked_wo_bk
+                rule.needed_keys_wo_bk = alt_num
+                # can this self lock a key if bk not avail? I'm thinking no.
+                # placement_self_lock_adjustment(rule, key_layout, ???, worst_ctr_wo_bk, world, player)
+                rule.check_locations_wo_bk = accessible_wo_bk
+        key_logic.placement_rules.append(rule)
+    if worst_ctr_wo_bk:
+        check_bk_restriction_needed(key_layout, worst_ctr_wo_bk, post_ctr, alt_num)
+
+
+def check_bk_restriction_needed(key_layout, worst_ctr_wo_bk, post_ctr, alt_num):
+    avail_keys = len(worst_ctr_wo_bk.key_only_locations)
+    place_able_keys = min(key_layout.max_chests, len(worst_ctr_wo_bk.free_locations))
+    if avail_keys + place_able_keys < alt_num:
+        accessible_wo_bk, post_set = set(), set()
+        accessible_wo_bk.update(worst_ctr_wo_bk.free_locations)
+        accessible_wo_bk.update(worst_ctr_wo_bk.key_only_locations)
+        post_set.update(post_ctr.free_locations)
+        post_set.update(post_ctr.key_only_locations)
+        key_layout.key_logic.bk_restricted.update(post_set.difference(accessible_wo_bk))
+
+
+def placement_self_lock_adjustment(rule, key_layout, blocked_loc, worst_ctr, world, player):
+    if len(blocked_loc) == 1 and world.accessibility[player] != 'locations':
+        max_ctr = find_max_counter(key_layout)
+        blocked_others = set(max_ctr.other_locations).difference(set(worst_ctr.other_locations))
+        important_found = False
+        for loc in blocked_others:
+            if important_location(loc, world, player):
+                important_found = True
+                break
+        if not important_found:
+            rule.needed_keys_w_bk -= 1
+
 
 def count_key_drops(sector):
     cnt = 0
@@ -211,6 +314,8 @@ def find_bk_locked_sections(key_layout, world):
     big_chest_allowed_big_key = world.accessibility != 'locations'
     for counter in key_counters.values():
         key_layout.all_chest_locations.update(counter.free_locations)
+        key_layout.all_locations.update(counter.free_locations)
+        key_layout.all_locations.update(counter.key_only_locations)
         if counter.big_key_opened and counter.important_location:
             big_chest_allowed_big_key = False
         if not counter.big_key_opened:
@@ -241,6 +346,28 @@ def relative_empty_counter(odd_counter, key_counter):
     return True
 
 
+def relative_empty_counter_2(odd_counter, key_counter):
+    if len(set(odd_counter.key_only_locations).difference(key_counter.key_only_locations)) > 0:
+        return False
+    if len(set(odd_counter.free_locations).difference(key_counter.free_locations)) > 0:
+        return False
+    for child in odd_counter.child_doors:
+        if unique_child_door_2(child, key_counter):
+            return False
+    return True
+
+
+def progressive_ctr(new_counter, last_counter):
+    if len(set(new_counter.key_only_locations).difference(last_counter.key_only_locations)) > 0:
+        return True
+    if len(set(new_counter.free_locations).difference(last_counter.free_locations)) > 0:
+        return True
+    for child in new_counter.child_doors:
+        if unique_child_door_2(child, last_counter):
+            return True
+    return False
+
+
 def unique_child_door(child, key_counter):
     if child in key_counter.child_doors or child.dest in key_counter.child_doors:
         return False
@@ -251,6 +378,14 @@ def unique_child_door(child, key_counter):
     return True
 
 
+def unique_child_door_2(child, key_counter):
+    if child in key_counter.child_doors or child.dest in key_counter.child_doors:
+        return False
+    if child in key_counter.open_doors or child.dest in key_counter.child_doors:
+        return False
+    return True
+
+
 def find_best_counter(door, odd_counter, key_counter, key_layout, world, player, skip_bk, empty_flag):  # try to waste as many keys as possible?
     ignored_doors = {door, door.dest} if door is not None else {}
     finished = False
@@ -280,7 +415,34 @@ def find_best_counter(door, odd_counter, key_counter, key_layout, world, player,
     return last_counter
 
 
-def find_potential_open_doors(key_counter, ignored_doors, key_layout, skip_bk):
+def find_worst_counter(door, odd_counter, key_counter, key_layout, skip_bk):  # try to waste as many keys as possible?
+    ignored_doors = {door, door.dest} if door is not None else {}
+    finished = False
+    opened_doors = dict(key_counter.open_doors)
+    bk_opened = key_counter.big_key_opened
+    # new_counter = key_counter
+    last_counter = key_counter
+    while not finished:
+        door_set = find_potential_open_doors(last_counter, ignored_doors, key_layout, skip_bk, 0)
+        if door_set is None or len(door_set) == 0:
+            finished = True
+            continue
+        for new_door in door_set:
+            proposed_doors = {**opened_doors, **dict.fromkeys([new_door, new_door.dest])}
+            bk_open = bk_opened or new_door.bigKey
+            new_counter = find_counter(proposed_doors, bk_open, key_layout)
+            bk_open = new_counter.big_key_opened
+            if not new_door.bigKey and progressive_ctr(new_counter, last_counter) and relative_empty_counter_2(odd_counter, new_counter):
+                ignored_doors.add(new_door)
+            else:
+                last_counter = new_counter
+                opened_doors = proposed_doors
+                bk_opened = bk_open
+            # this means the new_door invalidates the door / leads to the same stuff
+    return last_counter
+
+
+def find_potential_open_doors(key_counter, ignored_doors, key_layout, skip_bk, reserve=1):
     small_doors = []
     big_doors = []
     for other in key_counter.child_doors:
@@ -293,7 +455,7 @@ def find_potential_open_doors(key_counter, ignored_doors, key_layout, skip_bk):
     if key_layout.big_key_special:
         big_key_available = key_counter.big_key_opened
     else:
-        big_key_available = len(key_counter.free_locations) - key_counter.used_smalls_loc(1) > 0
+        big_key_available = len(key_counter.free_locations) - key_counter.used_smalls_loc(reserve) > 0
     if len(small_doors) == 0 and (not skip_bk and (len(big_doors) == 0 or not big_key_available)):
         return None
     return small_doors + big_doors
@@ -367,7 +529,7 @@ def create_rule(key_counter, prev_counter, key_layout, world, player):
 
 
 def check_for_self_lock_key(rule, door, parent_counter, key_layout, world, player):
-    if world.accessibility != 'locations':
+    if world.accessibility[player] != 'locations':
         counter = find_inverted_counter(door, parent_counter, key_layout, world, player)
         if not self_lock_possible(counter):
             return
@@ -489,6 +651,27 @@ def bk_restricted_rules(rule, door, odd_counter, empty_flag, key_counter, key_la
     #     key_layout.key_logic.bk_restricted.update(unique_loc)
 
 
+def find_worst_counter_wo_bk(small_key_num, accessible_set, door, odd_ctr, key_counter, key_layout):
+    if key_counter.big_key_opened:
+        return None, None, None
+    worst_counter = find_worst_counter(door, odd_ctr, key_counter, key_layout, True)
+    bk_rule_num = worst_counter.used_keys + 1
+    bk_access_set = set()
+    bk_access_set.update(worst_counter.free_locations)
+    bk_access_set.update(worst_counter.key_only_locations)
+    if bk_rule_num == small_key_num and len(bk_access_set ^ accessible_set) == 0:
+        return None, None, None
+    door_open = find_next_counter(door, worst_counter, key_layout)
+    ignored_doors = dict_intersection(worst_counter.child_doors, door_open.child_doors)
+    dest_ignored = []
+    for door in ignored_doors.keys():
+        if door.dest not in ignored_doors:
+            dest_ignored.append(door.dest)
+    ignored_doors = {**ignored_doors, **dict.fromkeys(dest_ignored)}
+    post_counter = open_some_counter(door_open, key_layout, ignored_doors.keys())
+    return worst_counter, post_counter, bk_rule_num
+
+
 def open_a_door(door, child_state, flat_proposal):
     if door.bigKey:
         child_state.big_key_opened = True
@@ -833,6 +1016,8 @@ def validate_key_layout_sub_loop(key_layout, state, checked_states, flat_proposa
     available_big_locations = cnt_avail_big_locations(ttl_locations, state, world, player)
     if invalid_self_locking_key(state, prev_state, prev_avail, world, player):
         return False
+    # todo: allow more key shuffles - refine placement rules
+    # if (not smalls_avail or available_small_locations == 0) and (state.big_key_opened or num_bigs == 0 or available_big_locations == 0):
     if (not smalls_avail or not enough_small_locations(state, available_small_locations)) and (state.big_key_opened or num_bigs == 0 or available_big_locations == 0):
         return False
     else: