Here is a hack for Prince of Persia which changes all the level layouts for a new game experience. Has a total of 16 custom levels and some graphical changes.
Starting time: 120 minutes
Prince of Persia (USA).sfc - NOINTRO
CRC32: 891BB2BB
MD5: 8FFC8D34BC75BC049122894B4292EB85
SHA-1: 29CE1E32CF57D8284D0670949045C0D9128C3E1B
SHA-256: 494190CD6D7FD68882CBE255A6E237D9C4BDAF3988615EDE0297A5E285AD5DD9