Various cheats

Unlock Cheats:
During gameplay press START and enter any of the following codes: 

Half Damage: 
     Square, Square, Circle, Circle, Left, Left, Right, Right, Circle,
Circle, Square, Square

Bulletproof: 
     Left, Right, Right, Left, Square, Circle, Circle, Square

Invincibility: 
     Left,  Right, Right, Left, Left, Right, Right, Left, Left, Right,
Right, Left, Square, Square

Infinite Ammo: 
     Square,  Circle,  Square, Circle, Square, Circle, Square, Circle,
Left, Circle, Square, Circle, Square, Circle, Square, Circle, Square

One-Shot Kills: 
     Circle, Left, Right, Right, Left, Circle, R2, L2, Circle, Square,
Square

M7 Turned Frag Launcher: 
     L2, R2, Right, Right, Left, Left, Right, Right, R2, L2, Square, Circle

Crossbow Turned Frag Launcher: 
     Left, Right, Right, Left, Square, Circle, L2, R2, Square, Circle,
Left, Right

Big Weapons: 
     Square, Square, Square, Square, Circle, Circle, Circle

Big Feet: 
     Right, Right, Right, Left, Right, Left, Right, Left, Left, Left

Skip Cutscene: 
     L2,  Square, L2, Circle, L2, Left, L2, Right, L2, R2, R2, Square,
R2, Circle, R2, Left, R2, Right, Square

Watch End Cinema: 
     R2, L2, Square, Square, Left, L2, L2, Square, Square, R2, Square