Super Mario FX

Super Mario FX is a game that was originally going to be released for the Super Nintendo Entertainment System, using the Super FX chip used in Super Mario World 2: Yoshi's Island and Super Mario RPG. It seemed, however, that even the chip didn't have enough capability to run this complex 3-d platformer, so it was moved to the Nintendo 64, and released as Super Mario 64. Interestingly, the Nintendo 64 was made partly for the purpose of making Super Mario 64.