Level select:
Press L1, L2, X, Triangle, L1, L2, X, Triangle at the main menu. Note: This code can also be enabled during game play.

Invincibility:
Start a single player game. Press Start to pause game play, then press L1, L2, Circle, Square, L1, L2, Circle, Square.

One hit kills:
Start a single player game. Press Start to pause game play, then press L1, L2, Left Analog-stick Up, Left Analog-stick Down, Left Analog-stick Left, Left Analog-stick Right, Triangle, Square, X, Circle.

All weapons:
Start a single player game. Press Start to pause game play, then press R1, L1, R2, L2, Circle, X, Square, Triangle.

Weapons do not weaken:
Start a single player game. Press Start to pause game play, then press R1, L1, X, Triangle, R2, L2, X, Triangle.

All magic:
Start a single player game. Press Start to pause game play, then press R1, R2, L1, L2, X, Triangle, Circle, Square.

All multi-player characters:
Press R2, Circle, X, Square, Triangle, Right, Down, Left, Up, L2, L1, Circle, Square, L1, L2, L1, Circle, L2, Square at the main menu.