Super Mario Bros. - Two Players Hack is a ROM hack of Super Mario Bros. made by Corpse Grinder in 2018. It is practically the same game as the original, with the notable difference that two players can play at the same time. As such, in a 2 player game, Mario and Luigi embark on a quest together to rescue Princess Peach from Bowser's clutches.

Together, HappyLee and Kzwbz improve on the previous run by nearly 5 seconds thanks to a slew of improvements, most of them in World 8 using ground-clipped Koopa shells.