diff --git a/BaseClasses.py b/BaseClasses.py
index 23005d5c..f0177fbd 100644
--- a/BaseClasses.py
+++ b/BaseClasses.py
@@ -88,6 +88,7 @@ class World(object):
         self.owwhirlpools = {}
         self.owflutespots = {}
         self.owsectors = {}
+        self.allow_flip_sanc = {}
         self.doors = []
         self._door_cache = {}
         self.paired_doors = {}
@@ -118,6 +119,7 @@ class World(object):
             set_player_attr('owcrossededges', [])
             set_player_attr('owwhirlpools', [])
             set_player_attr('owsectors', None)
+            set_player_attr('allow_flip_sanc', False)
             set_player_attr('remote_items', False)
             set_player_attr('required_medallions', ['Ether', 'Quake'])
             set_player_attr('bottle_refills', ['Bottle (Green Potion)', 'Bottle (Green Potion)'])
@@ -319,7 +321,9 @@ class World(object):
         return self.is_tile_swapped(0x2c, player)
 
     def is_dark_chapel_start(self, player):
-        return self.is_tile_swapped(0x13, player)
+        if self.allow_flip_sanc[player]:
+            return self.is_tile_swapped(0x13, player)
+        return self.mode[player] == 'inverted'
 
     def is_pyramid_open(self, player):
         if self.open_pyramid[player] == 'yes':
diff --git a/Main.py b/Main.py
index 8f67ff4c..7c1b9aea 100644
--- a/Main.py
+++ b/Main.py
@@ -593,6 +593,7 @@ def copy_world(world):
     ret.standardize_palettes = world.standardize_palettes.copy()
     ret.owswaps = world.owswaps.copy()
     ret.owflutespots = world.owflutespots.copy()
+    ret.allow_flip_sanc = world.allow_flip_sanc.copy()
     ret.prizes = world.prizes.copy()
     ret.restrict_boss_items = world.restrict_boss_items.copy()
     ret.inaccessible_regions = world.inaccessible_regions.copy()
@@ -788,6 +789,7 @@ def copy_world_premature(world, player):
     ret.standardize_palettes = world.standardize_palettes.copy()
     ret.owswaps = world.owswaps.copy()
     ret.owflutespots = world.owflutespots.copy()
+    ret.allow_flip_sanc = world.allow_flip_sanc.copy()
     ret.prizes = world.prizes.copy()
     ret.restrict_boss_items = world.restrict_boss_items.copy()
     ret.inaccessible_regions = world.inaccessible_regions.copy()
diff --git a/OverworldShuffle.py b/OverworldShuffle.py
index b47119c6..8e47e09a 100644
--- a/OverworldShuffle.py
+++ b/OverworldShuffle.py
@@ -151,7 +151,8 @@ def link_overworld(world, player):
     # tile shuffle
     logging.getLogger('').debug('Flipping overworld tiles')
     if world.owMixed[player]:
-        tile_groups, force_flipped, force_nonflipped, undefined_chance = define_tile_groups(world, False, player)
+        tile_groups, force_flipped, force_nonflipped, undefined_chance, allow_flip_sanc = define_tile_groups(world, False, player)
+        world.allow_flip_sanc[player] = allow_flip_sanc
         swapped_edges = shuffle_tiles(world, tile_groups, world.owswaps[player], False, (force_flipped, force_nonflipped, undefined_chance), player)
         
         update_world_regions(world, player)
@@ -241,7 +242,7 @@ def link_overworld(world, player):
         # the idea is to XOR the new flips with the ones from Mixed so that non-parallel edges still work
         # Polar corresponds to Grouped with no flips in ow_crossed_tiles_mask
         ow_crossed_tiles_mask = [[],[],[]]
-        tile_groups, force_flipped, force_nonflipped, undefined_chance = define_tile_groups(world, True, player)
+        tile_groups, force_flipped, force_nonflipped, undefined_chance, _ = define_tile_groups(world, True, player)
         world.owcrossededges[player] = shuffle_tiles(world, tile_groups, ow_crossed_tiles_mask, True, (force_flipped, force_nonflipped, undefined_chance), player)
         ow_crossed_tiles = [i for i in range(0x82) if (i in world.owswaps[player][0]) != (i in ow_crossed_tiles_mask[0])]
 
@@ -1184,7 +1185,7 @@ def define_tile_groups(world, do_grouped, player):
             tile_groups.append((group, lw_regions, dw_regions))
 
     random.shuffle(tile_groups)
-    return tile_groups, flipped_groups, nonflipped_groups, undefined_chance
+    return tile_groups, flipped_groups, nonflipped_groups, undefined_chance, allow_flip_sanc
 
 def remove_reserved(world, groupedlist, connected_edges, player):
     new_grouping = {}