kill.switch Cheats for PlayStation 2
In normal or hard difficulty setting successfully complete the game to unlock the option that will enable you to choose any level in the game.
Throw a grenade on any level when there are two enemies talking together. They will be too distracted to look and see what it was. This is useful at the begining of the Think like a gun level.
Complete the game, then press L1, R1, square, square.