Megaman in Super Mario Bros is a Nintendo rom hack that you can play in your browser. The controls and gameplay are identical, but the level layout, adversaries, and power-ups are all distinct and uniquely designed. The music varies depending on the character you're controlling; sound effects are available for all weapons and attacks; and the power-ups are incredible. The mushrooms provide Mega Man with her helmet/shot assault and her long-range attack against Samus. Bill from Contra receives a spread shot from Fireflower, who also links his laser sword to a new tunic. It's not clear why anyone would want to play Mario when Samus's Wave Beam can make quick work of Bowser.