While in-game, hit start to pause the game and the hold L, R, Triangle, and Left on the D-pad simultaneously to bring up the cheat console.

Enter the cheats one button at a time. You'll get a message when a cheat is entered successfully.

Code Effect

Left, square, up, triangle, down, cross, right, right All characters visible
Cross, square, triangle, cross, square, triangle, left, right All weapons unlocked
Up, up, up, left, down, up, up, right Civilians Invincible
Square, square, triangle, triangle, left, right, cross, cross Infinite ammo
Triangle, up, right, right, right, left, left, left Officers Invincible
Right, left, right, left, down, up, right, left Player 'invisible'
Square, square, triangle, up, up, down, down, suqare Player and officers fully promoted
Square, up, down, down, cross, left, up, down Player Invincible
Up, down, down, left, up, down, down, down Sounds are not heard
Square, triangle, left, up, down, cross, cross, down Stop the timer if one is active
Up, right, left, right, cross, right, cross, right Unlock Remixed Credits