diff --git a/Rom.py b/Rom.py
index d17fc0c4..b0b92b22 100644
--- a/Rom.py
+++ b/Rom.py
@@ -33,7 +33,7 @@ from source.classes.SFX import randomize_sfx
 
 
 JAP10HASH = '03a63945398191337e896e5771f77173'
-RANDOMIZERBASEHASH = '9dfff0f3d093eb9adce053e9773f523e'
+RANDOMIZERBASEHASH = 'f51b9d3d5d995d55c111af82570d8f04'
 
 
 class JsonRom(object):
diff --git a/asm/owrando.asm b/asm/owrando.asm
index f244cb79..b781b81b 100644
--- a/asm/owrando.asm
+++ b/asm/owrando.asm
@@ -391,6 +391,21 @@ OWWorldUpdate: ; x = owid of destination screen
 {
     lda.l OWTileWorldAssoc,x : cmp.l $7ef3ca : beq .return
         sta.l $7ef3ca ; change world
+
+        ; activate mirror portal sprite
+        phx : cmp #0 : beq + : lda #1
+        + cmp.l InvertedMode : bne +
+            lda #$09 : pha : bra .setPortalSpriteState
+        + lda #$07 : pha ; some state that allows the portal to persist without it getting overwritten
+        
+        .setPortalSpriteState
+        ldx #$0f
+        - lda $0e20,x : cmp #$6C : bne +
+            pla : sta $0dd0,x : plx : bra .playSfx
+        + dex : bpl -
+        pla : plx
+
+        .playSfx
         lda #$38 : sta $012f ; play sfx - #$3b is an alternative
 
         ; toggle bunny mode
diff --git a/data/base2current.bps b/data/base2current.bps
index 53c32fda..d4ddf56e 100644
Binary files a/data/base2current.bps and b/data/base2current.bps differ