diff --git a/C64/gr_basics.asm b/C64/gr_basics.asm
index e1e8846..5c29ac6 100644
--- a/C64/gr_basics.asm
+++ b/C64/gr_basics.asm
@@ -219,6 +219,8 @@ next8lines
 ;--------------------------------------------------
 .proc SetMainScreen
 	lda #$b          ; Grey background and border
+	lda WallsType
+	:4 rol
 	sta $d020
 	sta $d021
 	
diff --git a/scorchC64.prg b/scorchC64.prg
index 1fba9cd..f866a76 100644
Binary files a/scorchC64.prg and b/scorchC64.prg differ