Level select
To access level, pause the game, and then enter: Up, Down, Right, Left, X, X, X, Triangle.
Extra lives
To gain extra lives, pause the game, and then enter: Square, Down, Right, Circle, Square, Left, Up, X.
Extra continues
To gain extra contiunes, pause the game, and then enter: X, Up, Down, Triangle, Circle, Circle, Circle, L1.
First-person view
To access first person view, pause the game, and then enter: L1, Up, Left, Triangle, X, L2, R1, L2.
God mode
To access god mode, pause the game, and then enter: Left, Right, Left, Right, L1, R1, L1, R1.