technically this is emulation so posting it in emulation forum. someone perfectly emulated super mario bros on flash but you can also play as the nes versions of samus, bill rizer (contra), megaman, simon belmont, link (zelda 1), and of course mario. each play like they do in their nes games. simon has his whip and throws axes, megaman has the buster, link the sword (when get mushroom becomes master sword) bill rizer has his contra gun but with mushroom becomes machine gun, samus has her gun and turns into a ball and lays bombs. pretty cool. (when i mean perfectly I mean ever single level even the warps are still there

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also heads up yes zero suit samus is in there too. when you pick up fire flower you turn into zero suit samus. fire flower also gives megaman heat mans power, bill rizer gets spreader, links shoots his sword, and simon gets flame whip
http://www.newgrounds.com/portal/view/534416