To enter the codes, pause the game and enter the code. 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. These codes only work on Easy Mode and only on Single 
Player Campaign Mode.

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: 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	

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 	

Later---RvD.