diff --git a/bugfixes.asm b/bugfixes.asm
index 4a2dcba..f3ba207 100644
--- a/bugfixes.asm
+++ b/bugfixes.asm
@@ -49,7 +49,7 @@ DecideIfBunnyByScreenIndex:
 	; superbunny work
 	LDA $1B : BNE .done
 	LDA $7EF357 : BNE .done
-	LDA $8A : AND.b #$40 : PHA
+	PHX : LDX $8A : LDA.l OWTileWorldAssoc, X : PLX : PHA
 	LDA.l InvertedMode : BNE .inverted
 	.normal
 		PLA : EOR #$40
diff --git a/darkworldspawn.asm b/darkworldspawn.asm
index 693bab6..fb6355a 100644
--- a/darkworldspawn.asm
+++ b/darkworldspawn.asm
@@ -74,7 +74,7 @@ JMP DoWorldFix
 JMP DoWorldFix_Inverted_skip_mirror_check
 
 	.castle
-	LDA #$00 : STA $7EF3CA ; set flag to dark world
+	LDA #$00 : STA $7EF3CA ; set flag to light world
 	LDA $7EF3CC : CMP #$07 : BNE + : LDA.b #$08 : STA $7EF3CC : + ; convert frog to dwarf
 	.done
 RTL
@@ -84,7 +84,9 @@ RTL
 ;--------------------------------------------------------------------------------
 FakeWorldFix:
 	LDA FixFakeWorld : BEQ +
-		LDA $8A : AND.b #$40 : STA $7EF3CA
+		PHX
+			LDX $8A : LDA.l OWTileWorldAssoc, X : STA $7EF3CA
+		PLX
 	+
 RTL
 ;--------------------------------------------------------------------------------
diff --git a/entrances.asm b/entrances.asm
index 2b2f171..f0f94cf 100644
--- a/entrances.asm
+++ b/entrances.asm
@@ -184,7 +184,7 @@ PreventEnterOnBonk:
 	STA $00 ; part of what we wrote over
 	LDA.l InvertedMode : AND.w #$00FF : BEQ .done
 	LDA.l $5D : AND.w #$00FF : CMP.w #$0014 : BNE .done ;in mirror mode?
-	LDA.b $8A : AND.w #$0040 : CMP $7B : BEQ .done ; Are we bonking, or doing the superbunny glitch?
+	LDA.b $8A : TAX : LDA.l OWTileWorldAssoc, X : AND.w #$00FF : CMP $7B : BEQ .done ; Are we bonking, or doing the superbunny glitch?
 
 		; If in inverted, are in mirror mode, and are bonking then do not enter
 		JML.l PreventEnterOnBonk_BRANCH_IX
@@ -202,15 +202,15 @@ TurtleRockEntranceFix:
 RTL
 ;--------------------------------------------------------------------------------
 AnimatedEntranceFix: ;when an entrance animation tries to start
-	PHA
+	PHA : PHX
 	LDA.l InvertedMode : BEQ + ;If we are in inverted mode
-	LDA $8A : AND.b #$40 : BNE + ;and in the light world
-		PLA
+	LDX $8A : LDA.l OWTileWorldAssoc, X : BNE + ;and in the light world
+		PLX : PLA
 		STZ $04C6 ; skip it.
 		LDA #$00
 		RTL
 	+
-	PLA
+	PLX : PLA
 	STA $02E4 ;what we wrote over
 	STA $0FC1 ;what we wrote over
 	STA $0710 ;what we wrote over
diff --git a/inverted.asm b/inverted.asm
index b60085d..75d1aaa 100644
--- a/inverted.asm
+++ b/inverted.asm
@@ -202,7 +202,7 @@ MirrorBonk:
 	; otherwise fall through to .normal
 		PHX : PHP
 		PHB : PHK : PLB
-		LDA $8A : AND.b #$40 : BEQ .endLoop ;World we're in? branch if we are in LW we don't want bonks
+		LDX $8A : LDA.l OWTileWorldAssoc, X : BEQ .endLoop ;World we're in? branch if we are in LW we don't want bonks
 		REP #$30
 		LDX #$0000
 		.loop
diff --git a/invertedmaps.asm b/invertedmaps.asm
index 9098183..49d1229 100644
--- a/invertedmaps.asm
+++ b/invertedmaps.asm
@@ -19,7 +19,7 @@ Overworld_LoadNewTiles:
     +
 
     SEP #$30
-    LDA InvertedMode : BEQ .notInverted
+    LDX $8A : LDA.l OWTileMapAlt, X : BEQ .notInverted
     PHB
 
     ; Set the data bank to $7E.
diff --git a/multiworld.asm b/multiworld.asm
index f1f6990..6a4abf9 100644
--- a/multiworld.asm
+++ b/multiworld.asm
@@ -270,7 +270,8 @@ Multiworld_Ancilla_ReceiveItem_stillInMotion:
 
 Multiworld_ConsumingFire_TransmuteToSkullWoodsFire:
 {
-	LDA $8A : AND.b #$40 : BEQ .failed ; things we wrote over
+	;LDA $8A : AND.b #$40 : BEQ .failed ; things we wrote over
+	PHX : LDX $8A : LDA.l OWTileWorldAssoc, X : PLX : AND.b #$FF : BEQ .failed
 	LDA $0C4A : CMP #$22 : BEQ .failed
 	LDA $0C4B : CMP #$22 : BEQ .failed
 	LDA $0C4C : CMP #$22 : BEQ .failed
diff --git a/overrides.asm b/overrides.asm
index 8f78bb5..cb14548 100644
--- a/overrides.asm
+++ b/overrides.asm
@@ -47,7 +47,8 @@ OnFileLoadOverride:
 MirrorCheckOverride:
     lda.l DRFlags : and #$02 : beq ++
         lda $7ef353 : cmp #$01 : beq +
-    ++ lda $8A : and #$40 ; what I wrote over
+    ;++ lda $8A : and #$40 ; what I wrote over
+    ++ phx : ldx $8A : lda.l OWTileWorldAssoc,x : plx : and.b #$ff
     rtl
     + lda.l DRScroll : rtl
 
diff --git a/owrando.asm b/owrando.asm
index 161006d..962ed00 100644
--- a/owrando.asm
+++ b/owrando.asm
@@ -12,6 +12,48 @@ dw 0
 org $02a999
 jsl OWEdgeTransition : nop #4 ;LDA $02A4E3,X : ORA $7EF3CA
 
+;(replacing -> LDA $8A : AND.b #$40)
+org $00d8c4  ; < ? - Bank00.asm 4068 ()
+jsl.l OWWorldCheck
+org $0283dc  ; < ? - Bank02.asm 816 ()
+jsl.l OWWorldCheck
+org $02aa36  ; < ? - Bank02.asm 6559 ()
+jsl.l OWWorldCheck
+org $02aeca  ; < ? - Bank02.asm 7257 ()
+jsl.l OWWorldCheck16 : nop
+org $02b349  ; < ? - Bank02.asm 7902 ()
+jsl.l OWWorldCheck
+org $02c40a  ; < ? - Bank02.asm 10547 ()
+jsl.l OWWorldCheck
+org $05afd9  ; < ? - sprite_warp_vortex.asm 60 ()
+jsl.l OWWorldCheck
+org $07a3f0  ; < ? - Bank07.asm 5772 ()
+jsl.l OWWorldCheck
+org $07a967  ; < ? - Bank07.asm 6578 ()
+jsl.l OWWorldCheck
+org $07a9a1  ; < ? - Bank07.asm 6622 ()
+jsl.l OWWorldCheck
+org $07a9ed  ; < ? - Bank07.asm 6677 ()
+jsl.l OWWorldCheck
+org $07aa34  ; < ? - Bank07.asm 6718 ()
+jsl.l OWWorldCheck
+org $08d408  ; < ? - ancilla_morph_poof.asm 48 ()
+jsl.l OWWorldCheck
+org $0aba6c  ; < ? - Bank0a.asm 474 ()
+jsl.l OWWorldCheck16 : nop
+org $0aba99  ; < ? - Bank0a.asm 515 ()
+jsl.l OWWorldCheck
+org $0bfeab  ; < ? - Bank0b.asm 36 ()
+jsl.l OWWorldCheck16 : nop
+org $0cffb6  ; < ? - ?.asm ? ()
+jsl.l OWWorldCheck16 : nop
+org $0cffe8  ; < ? - ?.asm ? ()
+jsl.l OWWorldCheck16 : nop
+org $1beca2  ; < ? - palettes.asm 556 ()
+jsl.l OWWorldCheck16 : nop
+org $1bed95  ; < ? - palettes.asm 748 ()
+jsl.l OWWorldCheck16 : nop
+
 ;Code
 org $aa8800
 OWCoordIndex: ; Horizontal 1st
@@ -35,6 +77,19 @@ db 2, 2, 0, 0 ; For OWCameraRange
 OWCameraRange:
 dw $011E, $0100 ; Length of the range the camera can move on small screens
 
+OWWorldCheck:
+{
+    phx
+        ldx $8a : lda.l OWTileWorldAssoc,x
+    plx : and.b #$ff : rtl
+}
+OWWorldCheck16:
+{
+    phx
+        ldx $8a : lda.l OWTileWorldAssoc,x
+    plx : and.w #$00ff : rtl
+}
+
 org $aa9000
 OWEdgeTransition:
 {
@@ -660,3 +715,42 @@ dw $0f78, $0fb8, $0040, $0f98, $7c7c, $0000, $0000, $0048
 dw $0f20, $0f40, $0020, $0f30, $757e, $0000, $0000, $0049
 dw $0f70, $0fb8, $0048, $0f94, $757e, $0000, $0000, $004a
 dw $0058, $00c0, $0068, $008c, $8080, $0000, $0000, $0017 ;Hobo
+
+org $aaba00 ;PC 153a00
+OWTileWorldAssoc:
+db 0, 0, 0, 0, 0, 0, 0, 0
+db 0, 0, 0, 0, 0, 0, 0, 0
+db 0, 0, 0, 0, 0, 0, 0, 0
+db 0, 0, 0, 0, 0, 0, 0, 0
+db 0, 0, 0, 0, 0, 0, 0, 0
+db 0, 0, 0, 0, 0, 0, 0, 0
+db 0, 0, 0, 0, 0, 0, 0, 0
+db 0, 0, 0, 0, 0, 0, 0, 0
+db $40, $40, $40, $40, $40, $40, $40, $40
+db $40, $40, $40, $40, $40, $40, $40, $40
+db $40, $40, $40, $40, $40, $40, $40, $40
+db $40, $40, $40, $40, $40, $40, $40, $40
+db $40, $40, $40, $40, $40, $40, $40, $40
+db $40, $40, $40, $40, $40, $40, $40, $40
+db $40, $40, $40, $40, $40, $40, $40, $40
+db $40, $40, $40, $40, $40, $40, $40, $40
+
+org $aabb00 ;PC 153b00
+OWTileMapAlt:
+db 0, 0, 0, 0, 0, 0, 0, 0
+db 0, 0, 0, 0, 0, 0, 0, 0
+db 0, 0, 0, 0, 0, 0, 0, 0
+db 0, 0, 0, 0, 0, 0, 0, 0
+db 0, 0, 0, 0, 0, 0, 0, 0
+db 0, 0, 0, 0, 0, 0, 0, 0
+db 0, 0, 0, 0, 0, 0, 0, 0
+db 0, 0, 0, 0, 0, 0, 0, 0
+
+db 0, 0, 0, 0, 0, 0, 0, 0
+db 0, 0, 0, 0, 0, 0, 0, 0
+db 0, 0, 0, 0, 0, 0, 0, 0
+db 0, 0, 0, 0, 0, 0, 0, 0
+db 0, 0, 0, 0, 0, 0, 0, 0
+db 0, 0, 0, 0, 0, 0, 0, 0
+db 0, 0, 0, 0, 0, 0, 0, 0
+db 0, 0, 0, 0, 0, 0, 0, 0