diff --git a/BaseClasses.py b/BaseClasses.py
index b8a37691..ab008eff 100644
--- a/BaseClasses.py
+++ b/BaseClasses.py
@@ -25,6 +25,7 @@ class World(object):
         self.teams = 1
         self.owShuffle = owShuffle.copy()
         self.owKeepSimilar = {}
+        self.owParallelWorlds = {}
         self.shuffle = shuffle.copy()
         self.doorShuffle = doorShuffle.copy()
         self.intensity = {}
@@ -2095,6 +2096,7 @@ class Spoiler(object):
                          'goal': self.world.goal,
                          'ow_shuffle': self.world.owShuffle,
                          'ow_keepsimilar': self.world.owKeepSimilar,
+                         'ow_parallel': self.world.owParallelWorlds,
                          'shuffle': self.world.shuffle,
                          'door_shuffle': self.world.doorShuffle,
                          'intensity': self.world.intensity,
@@ -2174,6 +2176,7 @@ class Spoiler(object):
                 outfile.write('Item Functionality:'.ljust(line_width) + '%s\n' % self.metadata['item_functionality'][player])
                 outfile.write('Overworld Shuffle:'.ljust(line_width) + '%s\n' % self.metadata['ow_shuffle'][player])
                 outfile.write('Keep OW Edges Together:'.ljust(line_width) + '%s\n' % ('Yes' if self.metadata['ow_keepsimilar'][player] else 'No'))
+                outfile.write('Parallel Worlds:'.ljust(line_width) + '%s\n' % ('Yes' if self.metadata['ow_parallel'][player] else 'No'))
                 outfile.write('Entrance Shuffle:'.ljust(line_width) + '%s\n' % self.metadata['shuffle'][player])
                 outfile.write('Door Shuffle:'.ljust(line_width) + '%s\n' % self.metadata['door_shuffle'][player])
                 outfile.write('Intensity:'.ljust(line_width) + '%s\n' % self.metadata['intensity'][player])
diff --git a/CLI.py b/CLI.py
index e1ae72b6..5bb22827 100644
--- a/CLI.py
+++ b/CLI.py
@@ -144,6 +144,7 @@ def parse_settings():
         "shuffleganon": True,
         "ow_shuffle": "vanilla",
         "ow_keepsimilar": False,
+        "ow_parallel": False,
         "shuffle": "vanilla",
 
         "shufflepots": False,
diff --git a/Main.py b/Main.py
index df24228d..7e6e9233 100644
--- a/Main.py
+++ b/Main.py
@@ -74,6 +74,7 @@ def main(args, seed=None, fish=None):
     world.crystals_ganon_orig = args.crystals_ganon.copy()
     world.crystals_gt_orig = args.crystals_gt.copy()
     world.owKeepSimilar = args.ow_keepsimilar.copy()
+    world.owParallelWorlds = args.ow_parallel.copy()
     world.open_pyramid = args.openpyramid.copy()
     world.boss_shuffle = args.shufflebosses.copy()
     world.enemy_shuffle = args.shuffleenemies.copy()
diff --git a/Mystery.py b/Mystery.py
index b26e6ff9..f4dd0960 100644
--- a/Mystery.py
+++ b/Mystery.py
@@ -154,6 +154,7 @@ def roll_settings(weights):
     overworld_shuffle = get_choice('overworld_shuffle')
     ret.ow_shuffle = overworld_shuffle if overworld_shuffle != 'none' else 'vanilla'
     ret.ow_keepsimilar = get_choice('ow_keepsimilar')
+    ret.ow_parallel = get_choice('ow_parallel')
     entrance_shuffle = get_choice('entrance_shuffle')
     ret.shuffle = entrance_shuffle if entrance_shuffle != 'none' else 'vanilla'
     door_shuffle = get_choice('door_shuffle')
diff --git a/README.md b/README.md
index 9b60515c..291ede3e 100644
--- a/README.md
+++ b/README.md
@@ -10,6 +10,7 @@ This is a very new mode of LTTPR so the tools and info is very limited. There is
 
 # Known Issues
 (Updated 2021-04-26)
+(Updated 2021-05-04)
 
 ### If you want to playtest this, know these things:
 - Camera unlocking issues, which opens up the possibility of a hardlock. The workaround is to move Link around until the camera locks in place. DO NOT try to transition where there is a visible line.
@@ -56,6 +57,10 @@ OW is not shuffled.
 
 This keeps similar edge transitions together. ie. The 2 west edges will be paired to another set of two similar edges
 
+## Parallel Worlds (--ow_parallel)
+
+This ensures matching layouts of Light and Dark worlds. Any remaining edge transitions that don't have a matching counterpart will be shuffled amongst themselves. ie. If going right from Link's House leads to Blacksmith, then going right from Big Bomb Shop will lead to Hammer Pegs
+
 
 # Command Line Options
 
@@ -76,3 +81,9 @@ For specifying the overworld shuffle you want as above. (default: vanilla)
 ```
 
 This keeps similar edge transitions paired together with other pairs of transitions
+
+```
+--ow_parallel     
+```
+
+This ensures the layout of both worlds have the same shape
diff --git a/resources/app/cli/args.json b/resources/app/cli/args.json
index cfdba1cb..1e3ecdf1 100644
--- a/resources/app/cli/args.json
+++ b/resources/app/cli/args.json
@@ -120,6 +120,10 @@
     "action": "store_true",
     "type": "bool"
   },
+  "ow_parallel": {
+    "action": "store_true",
+    "type": "bool"
+  },
   "shuffle": {
     "choices": [
       "vanilla",
diff --git a/resources/app/cli/lang/en.json b/resources/app/cli/lang/en.json
index ee0d50bc..3c4825f6 100644
--- a/resources/app/cli/lang/en.json
+++ b/resources/app/cli/lang/en.json
@@ -203,7 +203,10 @@
       "                overworld screens from the same world.",
       "Crossed:        Overworld screen transitions can lead to any other overworld screen."
     ],
-    "ow_keepsimilar": [ "This keeps similar edge transitions together. ie. the two west edges on Potion Shop will be paired with another similar pair." ],
+    "ow_keepsimilar": [
+      "This keeps similar edge transitions together. ie. the two west edges on",
+      "Potion Shop will be paired with another similar pair." ],
+    "ow_parallel": [ "This ensures the layouts of both worlds are the same shape." ],
     "door_shuffle": [
       "Select Door Shuffling Algorithm. (default: %(default)s)",
       "Basic:          Doors are mixed within a single dungeon.",
diff --git a/resources/app/gui/lang/en.json b/resources/app/gui/lang/en.json
index eadfe436..5bbb8897 100644
--- a/resources/app/gui/lang/en.json
+++ b/resources/app/gui/lang/en.json
@@ -116,6 +116,7 @@
     "randomizer.overworld.overworldshuffle.crossed": "Crossed",
 
     "randomizer.overworld.keepsimilar": "Keep Similar Edges Together",
+    "randomizer.overworld.parallelworlds": "Parallel Worlds",
     
     "randomizer.entrance.openpyramid": "Pre-open Pyramid Hole",
     "randomizer.entrance.shuffleganon": "Include Ganon's Tower and Pyramid Hole in shuffle pool",
diff --git a/resources/app/gui/randomize/overworld/widgets.json b/resources/app/gui/randomize/overworld/widgets.json
index 5aa2d7cc..ee79e5a4 100644
--- a/resources/app/gui/randomize/overworld/widgets.json
+++ b/resources/app/gui/randomize/overworld/widgets.json
@@ -11,6 +11,10 @@
     "keepsimilar": {
       "type": "checkbox",
       "default": true
+    },
+    "parallelworlds": {
+      "type": "checkbox",
+      "default": true
     }
   }
 }
\ No newline at end of file
diff --git a/source/classes/constants.py b/source/classes/constants.py
index 68df9519..0d722627 100644
--- a/source/classes/constants.py
+++ b/source/classes/constants.py
@@ -72,7 +72,8 @@ SETTINGSTOPROCESS = {
     },
     "overworld": {
       "overworldshuffle": "ow_shuffle",
-      "keepsimilar": "ow_keepsimilar"
+      "keepsimilar": "ow_keepsimilar",
+      "parallelworlds": "ow_parallel"
     },
     "entrance": {
       "openpyramid": "openpyramid",