All weapons
Press R, L, Up, Down, A, Up, X, A during game play.
Unlimited ammunition
Press R, L, A, Up, Down, B, X, R, R during game play.
Level select
Press R, L, Up, Down, X, Y, B at the main menu.
Level skip
Press R, L, Up, Down, A, X, click Left Analog-stick, press B, A, B, A during game play. Enable this code immediately after starting a level to complete it with a "Silent Assassin" rank.
Nailgun mode
Press R, L, Up, Down A, White, White during game play. Weapons will pin people to walls when this code is activated. Alternately, press R, L, Up, Down, A, Black, White(2) during game play.
God mode
Press R, L, Up, Down, A, R, L, Black, White during game play.
Slow motion
Press R, L, Up, Down, A, Up, L during game play.
Punch mode
Press R, L, Up, Down, A, Up, Up during game play.
Lethal charge
Press L, R, Up, Down, A, Black, Black during game play.
Full heal
Press R, L, Up, Down, A, Up, Down during game play.
Megaforce mode
Press R, L, Up, Down, A, R during game play. Restart the level to remove its effect.
Toggle gravity
Press R, L, Up, Down, A, L, L during game play.