All Characters 

• At the menu screen quickly press right, down, down-right, down, down-left, left, triangle. You should hear a "whack" sound and the Game Start" letters should turn red. Start a game or a versus match. A new menu should appear that allows you to play as any character. Note: The enemies have the same HP as in the game. Pick a bunny and you're easy pickings. Pick Zeiram and your near invulnerable. 

Extra Mode 

• At the menu screen hold left for several seconds, then quickly press right, circle, triangle. You should hear a "whack" sound and the option letters should turn red. You can now enter options and select "Extra" mode where you and the enemies are energized and sped up! 

Versus Mode 

• At the main menu, rotate the joystick 360 degrees then press X, Square, Circle, Triangle. If done correctly you will hear a sound and Versus Mode will be available.