Pause the game, hold L + R, and enter the following codes:
Up, Up, Down, Down, Left, Left, Right, Right,  ,  |
Invincibility |
, ,  , , ,  , , , Right, Down |
Unlimited Ammo |
| Up, Up, Down, Down, Left, Right, Left, Right, , O |
All Weapons and Weapon Upgrades |
| , , , , , , , , Down, Right |
Refill Ammo |
Thanks to Revolution reader Sandoval!
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