Here is a full game hack for Super Metroid. Unfortunately the details of it are in japanese on the site it was claimed from. From what is gathered there have been some ASM tweaks and of course the entire map has been changed. Enjoy!
Here is a DEMO Vid for the hack at this link.
Super Metroid (Japan, USA) (En,Ja).sfc - NOINTRO
CRC32: D63ED5F8
MD5: 21F3E98DF4780EE1C667B84E57D88675
SHA-1: DA957F0D63D14CB441D215462904C4FA8519C613
SHA-256: 12B77C4BC9C1832CEE8881244659065EE1D84C70C3D29E6EAF92E6798CC2CA72