Enter each of the following codes during a game as follows: press start to pause the game, input the code, then press start to unpause. After successfully entering a code, a confirmation will appear at the bottom of the screen after unpauseing the game. To access the level select, you must return to the main menu after entering the code.

1st Person view - L, Left, R, Right, X, X, Down, Down, R, L

Invincibility - Up, Down, Left, Right, X, Up, Down, Left, Right, Y

More Grenades - Down, Down, Down, Down, Down, Up, Up, Up, Up, R

More Lives - A, B, Y, X, L, R, Up, Down, Left, Right

More Credits - A, B, Left, A, B, Right, B, A, Down, R

Level Select - Up, Down, Up, Down, Up, Down, Left, Right, Right, Y

Level Skip - Y, Y, X, X, L, R, Down, Down, Up, Up

Watch Ending - L, R, L, R, Left, Right, Left, Right, Y, X

Gameshark Codes:

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.