Here is a kaizo level hack for Super Mario World which tests the use of nontrivial exploits and game-play to get through the tough game.
Super Mario World (USA).sfc - NOINTRO
CRC32: B19ED489
MD5: CDD3C8C37322978CA8669B34BC89C804
SHA-1: 6B47BB75D16514B6A476AA0C73A683A2A4C18765
SHA-256: 0838E531FE22C077528FEBE14CB3FF7C492F1F5FA8DE354192BDFF7137C27F5B