All weapons
Pause the game, then hold L and press Right, X(2), Y, X. If you entered the code correctly, a message will appear. Note: Only weapons normally available in the current level will be unlocked.

Invisible mode
Pause the game, then hold L and press Up, Left, Right, Up, X. If you entered the code correctly, a message will appear.

Slow-motion mode
Pause the game, then hold L and press Left, Down, Up, Right, X. If you entered the code correctly, a message will appear.

Fish eye camera
Pause the game, then hold L and press Left, Up, Right, Down, X. If you entered the code correctly, a message will appear.

Beagle holes, footprints, and burns
Pause the game, then hold L and press Down, Up, X, Y, X. If you entered the code correctly, a message will appear.

Alternate fade
Pause the game, then hold L and press Right, Up(2), Down, X. If you entered the code correctly, a message will appear.

Alternate lighting
Pause the game, then hold L and press Up, Right, Up, Down, X. If you entered the code correctly, a message will appear.