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Nintendo Wii - Mario Bros. cheats

Jump through floors:
Note: To perform the following trick, you have to pause the game in good 
time (required perfect timing), so this will not work always.

Jump right under a floor. Right when you're about to hit the bottom of the 
floor, press the START button to pause the game play. Then press Start 
again to resume the game.

If you done correctly, you will jump right through the floor and 
end up on top of it.