Freedom Fighters

Enter the following during the middle of gameplay:

• Y, A, B, X, X, L - shotgun
• Y, A, B, X, X, LEFT - invisibility
• Y, A, B, X, X, RIGHT - slow motion
• Y, A, B, X, X, DOWN - fast motion
• Y, A, B, X, A, R - change spawn point
• Y, A, B, X, A, RIGHT - infinite ammo
• Y, A, B, X, A, DOWN - max charisma
• Y, A, B, X, A, LEFT - nail gun
• Y, A, B, X, Y, R - sub machine gun
• Y, A, B, X, Y, RIGHT - sniper rifle
• Y, A, B, X, Y, LEFT - rocket launcher
• Y, A, B, X, Y, DOWN- heavy machine gun
• Y, A, B, X, B, L - ragdolls

To unlock the extra stage, Liberty Island, just beat the game on any difficulty.