Pause the game and press 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. If you entered the code 
correctly, you will hear a sound. Note: This code only works in Campaign mode on 
the Easy difficulty setting, and will only remain in effect for the current 
level and will be disabled when the game is stopped or after the level is 
completed.