When you're in a bad situation when the computers are winning press start go to control settings press a on the com that is winning and switch it with your guy you can make the com do stupid stuff.

>Beat the game to get Bowser's place!

>Get a few from each category to unlock Battle Stadium!

*>Get all Minigames and then unlock the mini-game coaster!

*note: This option will freeze sometimes, or at least it did on me!