Super Mario Bros. 3 "The Quantum Realm" is one of the hardest and most bizzare hacks of smb3.
Indulge yourself in a realm of darkness and enter into a deadly 1st world. The game does get easier as you progress from world to world but there will be extremely difficult levels as well as easy ones throughout the entire game.
This hack also contains the concept of time travel which is only encountered occasionally. Players who are into extreme difficulty shouldn't be disappointed. The game is beatable but will require save states and lots of patience.
Super Mario Bros. 3 (U) (PRG0) [!].nes - GOODNES 3.14
CRC32: 85A79D9C
MD5: BB5C4B6D4D78C101F94BDB360AF502F3
SHA-1: A03E7E526E79DF222E048AE22214BCA2BC49C449
SHA-256: 6EA0777CA520BA7AD7B0EA0F6452140D59AA0B1DFFE5045CB1E8020DDE10C267