diff --git a/Rom.py b/Rom.py
index 8f12da64..953d31f8 100644
--- a/Rom.py
+++ b/Rom.py
@@ -27,7 +27,7 @@ from EntranceShuffle import door_addresses, exit_ids
 
 
 JAP10HASH = '03a63945398191337e896e5771f77173'
-RANDOMIZERBASEHASH = '287a85bc8ba1815c2e9b41d0cd79b869'
+RANDOMIZERBASEHASH = '1d9b62cedf002fdb9aebc750d75543ef'
 
 
 class JsonRom(object):
@@ -2196,6 +2196,10 @@ def write_strings(rom, world, player, team):
     rom.write_bytes(0x76CC0, [byte for p in pointers for byte in [p & 0xFF, p >> 8 & 0xFF]])
 
 def set_inverted_mode(world, player, rom):
+    # flip inverted map flags
+    for b in range(0x00, 0x80):
+        rom.buffer[0x153B00 + b] = (rom.buffer[0x153B00 + b] + 1) % 2
+    
     rom.write_byte(snes_to_pc(0x0283E0), 0xF0)  # residual portals
     rom.write_byte(snes_to_pc(0x02B34D), 0xF0)
     rom.write_byte(snes_to_pc(0x06DB78), 0x8B)
diff --git a/asm/owrando.asm b/asm/owrando.asm
index 161006de..962ed005 100644
--- a/asm/owrando.asm
+++ b/asm/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
diff --git a/data/base2current.bps b/data/base2current.bps
index 9c9e4cdf..b415a1fc 100644
Binary files a/data/base2current.bps and b/data/base2current.bps differ