These codes only work during the Single Player Campaign Mode. To enter the codes, pause the game and enter the code. You don't have to enter them too fast to work. The codes only work on the current level and must be reactivated every level. You will hear a sound to confirm the code entry was successful.

Code - Effect

Pause the game and enter: Up(2), Down(2), Left, Right, Left, Right, X, Y, RB+LB 500 - Thermal Energy
Pause the game and enter: Down(3), Up, Y, Up, Y, Up, Y, Up(3), Down, X, Down, X, Down, X, Left, Y, Right, X, Left, Y, Right, X, RB+LB - Infinite Health
Pause the game and enter: RT, RB, Y, X, Right, Down, Left, LB, LT, RT, RB, Y, X, Right, Down, Left, LB, LT, RT, LT, LB, RB, Y, Left, Down, X, RB+LB - Infinite Ammunition