kill.switch cheats and cheat codes for Playstation 2

Unlimited Ammo
Press L1, R1, SQUARE, SQUARE or L1, R1, TRIANGLE, SQUARE, SQUARE
while pausing the game play.

Stage selection:
Finish the game in normal or hard mode once

Kill enemies:
Pull the trigger when somebody is in your red colored crosshairs

Hint: You could select level with out beating the game how load your game and abort the mission and press star.You should see select mission.