Apparently, it was intended to be a Mario hack for novices.
You can play as Mario and Luigi, and you have to clear four levels. This should be a nice training hack to play before trying to beat SMB The Lost Levels, because you can test Luigi's Lost Levels abilities here.
Super Mario Bros. (World).nes - NOINTRO
CRC32: 3337EC46
MD5: 811B027EAF99C2DEF7B933C5208636DE
SHA-1: EA343F4E445A9050D4B4FBAC2C77D0693B1D0922
SHA-256: F61548FDF1670CFFEFCC4F0B7BDCDD9EABA0C226E3B74F8666071496988248DE