Cheat List:
Complete all mission objectives in the single player game for the cheats to become available. Then during game play press BACK, then press the following buttons to activate the corresponding cheat:
Big Heads: A, X, B, Y, A
Big Bodies: B, B, Y, X, X, A
Chicken Explosives: X, X, Y, A, B
Paper Mode: B, A, X, Y, A
Slow Mo: Y, Y, B, X, A
High Pitched Voices: X, A, Y, B, X
Team God Mode: Pause the game, select Enter Cheats and enter this code: BAYYABAXXX. Note: You can't unlock anything with this cheat.
Unlock Characters:
W. Jacobs: Complete Special Objective in Campaign Mission 1 on any difficulty
H. Ramirez: Complete Special Objective in Campaign Mission 2 on any difficulty
K. Henkel: Complete Special Objective in Campaign Mission 3 on any difficulty
J. Stone: Complete Special Objective in Campaign Mission 4 on any difficulty
S. Grey: Complete Special Objective in Campaign Mission 5 on any difficulty
B. Gordon: Complete Special Objective in Campaign Mission 6 on any difficulty
A. Galinsky: Complete Special Objective in Campaign Mission 1 on Recruit during a Quick Mission in Mission Mode
D. Munz: Complete Special Objective in Campaign Mission 2 on Veteran during a Quick Mission in Mission Mode
N. Tunny: Complete Special Objective in Campaign Mission 3 on Elite during a Quick Mission in Mission Mode
L. Cohen: Complete Special Objective in Campaign Mission 4 on Recruit during a Quick Mission in Mission Mode
G. Osadze: Complete Special Objective in Campaign Mission 5 on Veteran during a Quick Mission in Mission Mode
S. Ibrahim: Complete Special Objective in Campaign Mission 6 on Elite during a Quick Mission in Mission Mode
Unlock Modes:
Chicken Mode: Complete Campaign Mission 8 in Firefight Mode on Veteran. You must use a full team and none of your teammates may die.
Slo-Mo Mode: Complete Campaign Mission 5 in Recon Mode on Elite. You may only use one soldier.
Meganoggin Mode: Complete Campaign Mission 7 in Defend Mode on Recruit. You must use a full team and none of your teammates may die.
Paper Mode: Complete Campaign Mission 6 in Firefight Mode on Veteran using only one support soldier.
Helium Mode: Complete Campaign Mission 4 in Defend Mode on Veteran using only one soldier.
Run Fast Mode: Complete Campaign Mission 1 in Recon Mode on Elite using a full team.