Energy Regain:
When you get knocked down in a fight, hit the buttons rapidly -
X, Square, Triangle and Circle. this will regain your energy. (note: you can
also hit the buttons X, Square, Triangle and Circle when you knock someone
down, and that will also regain your energy.
Turbo Mode/Rumble Mode:
When you get "rumble" hit and hold R1 and L1 at the same time, then you will
get the tourbo mode which gives you infinite stamina.
Selene Strike move:
Press Forward, Forward, Triangle, Back, Back, X to throw a spear.
Champ class boxers:
Enter championship mode and enter CHAMP as a gym name.
Exit championship mode and enter arcade mode to have access to all the boxers including Damien Black.
Gold class boxers:
Enter championship mode and enter GOLD as a gym name. Note: This also unlocks Nat Daddy in arcade mode.
Silver class boxers:
Enter championship mode and enter SILVER as a gym name. Note: This also unlocks Bruce Blade in arcade mode.
Bronze class boxers:
Enter championship mode and enter BRONZE as a gym name. Note: This also unlocks Kemo Claw in arcade mode.
Alternate costumes:
Press Square + Circle at the character selection screen.
Unlock Damien Black:
During character select press L1 + R2 + Square + Circle