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.
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!
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 youre easy pickings. Pick Zeiram and your near
invulnerable.