When playing 2 player VS mode, at the screen to choose a character, hold down both the R and L buttons on both controllers at the same time and you can select one of the evil characters to play.
Choose the 1p Vs. mode, and move the cursor to 'Hard.' Hold L and Up, then press A. The game just switched to Super-Hard Mode!
On the VS. mode for 1P game, as soon as the Rainbow screen goes away, QUICKLY hold X&Y. You will be able to select any of the rescued characters!
On startup, Yoshi says 'Nintendo!' Press B,A,L,L during this time and you'll hear a tone. The game just upped its dif- ficulty! Each time you perform a combo or chain, the stack will NOT stop rising! Good luck!
Special, Extra Level Password
Select 1 player, then go to passwords and enter: "FP5D29J!" to get extra levels.