Invincibility
     Pause  gameplay,  hold  L2  and  press  Up,  Left,  Down,  Right,
Triangle, Square, X, Circle.

All Weapons
     Pause  gameplay,  hold  L2  and  press  Up,  Left,  Right,  Down,
Triangle, Square, Circle, X.

Secondary Attack Weapon
     Pause  gameplay,  hold  L2  and  press  Up,  Down,  Left,  Right,
Triangle, X, Square, Circle.

Infinite Ammo
     Pause  gameplay,  hold L2 and press Down, Left, Right, X, Square,
Circle.

Collect Shield
     Pause  gameplay,  hold  L2  and  press  Up, Let, Right, Triangle,
Square, Circle.

Stealth Mode
     Pause gameplay, hold L2 and press X, X, Square, Square, Triangle,
Triangle, Circle, Circle, X, X.