A complete hack (sound, music, game play, level structure, etc.) upping the difficulty in Super Mario Bros by giving you Captain Toad to play with instead of Mario.This probably would require a complete level restructuring in all the worlds. Since Captain Toad can't jump or use any power ups (no growth or fireballs), it should be interesting to see how one would get through a level in 2D sidescrolling style. Also having to fight Draggadon on Levels 1-4, 2-4, 3-4, 4-4, 6-4, and 7-4 and then Wingo on 5-4 and 8-4. Of course since Captain Toad can't jump this is a matter of just climbing up and up ladders and vines until you read the top (rather than just running under Bowser to an Axe). A unique star would be in place of the Axe and it would probably cause whatever boss you fought to be defeated that way.