This is a hack that lets you play as a Koopa Troopa. That's pretty much it.
No-Intro Name: Super Mario Bros. (World)
(No-Intro version 20130731-235630)
File SHA-1: EA343F4E445A9050D4B4FBAC2C77D0693B1D0922
ROM SHA-1: FACEE9C577A5262DBE33AC4930BB0B58C8C037F7
Patched File SHA-1: 633C95DB89E0C1E1CD50C58CF9A7B98466D1DFCC
Patched ROM SHA-1: C210BADEB99E5643C9DB3D91E7639F6A523D329A