TKB Super Mario Bros.
Original title: Super Mario Bros.
Platform: Nintendo Entertainment System
Region: USA (Update Hacks)
Media: Cartridge
Controller: NES Gamepad
Genre: Platformer 
Gametype: Hack
Release Year: 2009
Hacked by: TKB
Version: 1
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This is mostly a level hack of Super Mario Bros. with a bit of hex editing. It is somewhat harder than the original SMB1 (but not hard like Kaizo or Air).

http://www.romhacking.net/hacks/531/