Yup. I have gone insane again. I put Bad Apple in Sonic CD (well, Palmtree Panic Act 1 only, really, but still).
Just provide the original CD files in the _Original folder for the region you want, and run ".Make.bat"
- Yes, it lags. Transferring a whole tilemap into VRAM is pretty intensive, especially when done very often. Not much I can really do without refactoring how Sonic CD works.
- The foreground disappears, because that's where Bad Apple!! gets rendered to.