Cheat Mode:

Enter the following at the Title Screen: Y, A, B, B, Y, A, X, B, X, B Then press X to display the Level Select Screen.

Invincible:

After enabling Cheat Mode, enter the following during game play: Hold L + Y + Start.

All Weapons, Ammo, Inventory & Health:

After enabling Cheat Mode, enter the following during game play: Hold L + A + Start.

Level Skip:

After enabling Cheat Mode, enter the following during game play: Hold L + X + Start.

Game Shark Codes: