This is a hack of Super Mario Bros that was originally made for a pair of twin brothers for their birthday.
It has nearly all, excluding a castle or two, levels completely changed, nearly all the graphics and palettes changed, as well as edited music and fireball behavior.
No-Intro Name: Super Mario Bros. (World)
(No-Intro version 20130731-235630)
File SHA-1: EA343F4E445A9050D4B4FBAC2C77D0693B1D0922
ROM SHA-1: FACEE9C577A5262DBE33AC4930BB0B58C8C037F7