Here is a hack for Super Mario Bros. which changes the graphics and levels. Mario is played by Mr.Krabbs of Spongebob Squarepants and the enemies of been changed to represent the inhabitants of Bikini Bottom.
Fight the Flying Dutchman and save Spongebob in Super Mr.Krabbs!
Super Mario Bros. (World).nes - NOINTRO
CRC32: 3337EC46
MD5: 811B027EAF99C2DEF7B933C5208636DE
SHA-1: EA343F4E445A9050D4B4FBAC2C77D0693B1D0922
SHA-256: F61548FDF1670CFFEFCC4F0B7BDCDD9EABA0C226E3B74F8666071496988248DE