Use these combos when the game is paused. Hold L1 and enter one of the following codes:
Unlimited health: Y, X, Y, X, Y, B, Y, B
Daywalker Difficulty Setting: Left, B, Up, Down, X, B, A
Unlimited Range: Left, Down, Left, Down, Right,Up, Right, Up
Unlimited Ammo: Left, B, Right, X, Up, Y, Down, A
Make Friendly Beings Invincible (for escort missions): X, B, Y, A, X, B, Y, A
All Weapons: X, B, Down, Left, B, B, Y