Ready to rumble

unlock all championship class boxers

enter champ as your gym name in the championship mode to get to play as the best boxers, including damian black.

Unlock all gold class boxers

use gold as your gym name to unlock all the gold class boxers including Nat daddy.

Unlock silver class boxers

enter silver as your gym name.

Unlock all bronze class boxers

enter bronze as your gym name.

Change costume

press up(cpad) and left(cpad) together to alter your boxers costume.

Cheap vitamins

if you haven't got enough money to afford a training item, select it on the menu, then press a and left Together.