diff --git a/assets/asm/mosaic_change.asm b/assets/asm/mosaic_change.asm
new file mode 100644
index 00000000..515e36be
--- /dev/null
+++ b/assets/asm/mosaic_change.asm
@@ -0,0 +1,53 @@
+org <HOOK>
+    JML AreaCheck
+
+AreaCheck:
+{
+    PHB : PHK : PLB
+
+    TAX
+    LDA .pool, X
+
+    BEQ .noMosaic1
+        PLB
+        JML $02AAE5
+
+    .noMosaic1
+
+    LDX $8A
+    LDA .pool, X
+
+    BEQ .noMosaic2
+        PLB
+        JML $02AAE5
+
+    .noMosaic2
+
+    PLB
+    JML $02AAF4
+
+    .pool
+    ;LW
+    db $01, $00, $00, $00, $00, $00, $00, $00
+    db $00, $00, $00, $00, $00, $00, $00, $00
+    db $00, $00, $00, $00, $00, $00, $00, $00
+    db $00, $00, $00, $00, $00, $00, $00, $00
+    db $00, $00, $00, $00, $00, $00, $00, $00
+    db $00, $00, $00, $00, $00, $00, $00, $00
+    db $00, $00, $00, $00, $00, $00, $00, $00
+    db $00, $00, $00, $00, $00, $00, $00, $00
+    ;DW
+    db $01, $00, $00, $00, $00, $00, $00, $00
+    db $00, $00, $00, $00, $00, $00, $00, $00
+    db $00, $00, $00, $00, $00, $00, $00, $00
+    db $00, $00, $00, $00, $00, $00, $00, $00
+    db $00, $00, $00, $00, $00, $00, $00, $00
+    db $00, $00, $00, $00, $00, $00, $00, $00
+    db $00, $00, $00, $00, $00, $00, $00, $00
+    db $00, $00, $00, $00, $00, $00, $00, $00
+    ;SP
+    db $00, $00, $00, $00, $00, $00, $00, $00
+    db $00, $00, $00, $00, $00, $00, $00, $00
+    db $00, $00, $00, $00, $00, $00, $00, $00
+    db $00, $00, $00, $00, $00, $00, $00, $00
+}
\ No newline at end of file