Yep with the moving Clouds, the tutorial is on retro but is not easy. I tried the code before in my current project (Metal Sonic Overloaded) and got 2 Out-of-Range errors or something. (I'm using ASM68k) but ignore that, I'm going to try and put it in Metal Sonic in S1 for next version. EDIT: The sprites on S3K hack is flawless. nobody would even dare change every sprite of Sonic plus Extra art which is total torture. and I couldn't find the mappings to save in.