Here's a neat little thing where you can play as several characters, such as Link, Samus, or Ryu Hayabusa, to go through the levels in the original Super Mario Bros. game.
http://explodingrabbit.com/resources/super-mario-bros-crossover.84/
Super Mario Bros. Crossover
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Oh! that was fun thanks for the link qt!
Oh man, I remember this game back in the day. Fun stuff.