Level Skip
     During  gameplay  and  press  Y,  Y,  X,  X,  Left trigger, Right
trigger, Down, Down, Up, Up.

Extra Lives
     During  gameplay  and  press  A,  B,  X,  Y,  Left trigger, Right
trigger, Up, Down, Left, Right.

Extra Credits
     During  gameplay  and  press A, B, Left, A, B, Right, B, A, Down,
Right trigger.

Easter Egg
     During  gameplay, press Left Trigger, Left, Right Trigger, Right,
X, X, Down, Down, Right Trigger, Left Trigger.

Grenades
     During  gameplay, press Down, Down, Down, Down, Down, Up, Up, Up,
Up, Right Trigger.

Instant Win
     During gameplay, press Left Trigger, Right Trigger, Left Trigger,
Right Trigger, Left, Right, Left, Right, Y, X.

Level Select
     During gameplay, press Up, Down, Up, Down, Up, Down, Left, Right,
Right, Y.

Shields
     During  gameplay, press Up, Down, Left, Right, X, Up, Down, Left,
Right, Y.

God Mode and All Weapons
     Pause  gameplay  and  press  Up, Down, Left, Right, Left Trigger,
Right Trigger, Left, Right, Start.

First Person View
     Pause gameplay and press L, Left, R, Right, X, X, Down, Down, R, L.