Frank's first "ultimate" Super Mario Bros. hack. It's pretty good, really, but absolutely pales in comparison to the third one. Still, if you liked that one, and are looking for more of the same, this is a pretty good bet. It has 28 levels instead of 20, essentially meaning the levels are stretched out thinner. Which means, overall, they're not quite as interesting.
Super Mario Bros. (World).nes - NOINTRO
CRC32: 3337EC46
MD5: 811B027EAF99C2DEF7B933C5208636DE
SHA-1: EA343F4E445A9050D4B4FBAC2C77D0693B1D0922
SHA-256: F61548FDF1670CFFEFCC4F0B7BDCDD9EABA0C226E3B74F8666071496988248DE