Replay: To re-play a castle hold L + R on a castle.
Skip Levels: To skip a couple of levels on Vanilla Dome just go to level two and get the red switch palace. Complete the palace and go back to the first level of the dome do the level as normal but you will eventually come to a stair way of red blocks with exclamation marks. Jump up these and hit the block a vine will appear. Climb and you will find a lock and key it will take you through some incredibly easy levels and take you to the 4th castle.
Infinite Lives: Enter Bowser's castle and push; L, R, L, R, L, R, L, R, A, B
Yoshi's Girlfriend Push; L, L, L, R, R, R, X, Y, B, A
This one's a novelty, but kind of cute. Just after you send Bowser Koopa packing and Princess Peach Toadstool is on her way down, hold L, R, X, Y, up (in no particular order, do it all at once) until the credits roll. The cheat gets Mario (or Luigi) to move weird on the journey back to Yoshi's House.
