Enter the following codes at the 'Title' menu to unlock the corresponding effect. More than one code can be active at once but will be disabled when accessing online gameplay.
Unlock Player 1 God Mode:
Press Up, X, Square, Circle, Triangle, Down (player 1 will not lose health and cannot die).
Unlock Player 2 God Mode:
Press Down, Circle, Square, X, Triangle, Up (player 2 will not lose health and cannot die).
Unlock Slice Mode:
Press L2, Square, X, Square, X, R2 (ALL strikes cause dismemberment).
Unlock Sudden Death Mode:
Press Square, R1, Up, Down, L1, X (ALL warriors start the round with critical health and one hit finishes the match).
Unlock Zombie Mode:
Press X, X, X, Square, Circle (See ALL of the damage textures for each warrior. Players win by cutting off both of their opponent's legs).