Pause the game and press 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. 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.