Start a game. Press Back while playing the game to display the main menu. Then at the main menu, hold L + R + click Left Analog-stick + click Right Analog-stick, and quickly press White, Black(2), White(2), Black. A cheat option will appear. The cheat menu will have "All Weapons" and "Refill" (restores ammunition, painkillers, and bullet time) options. To use these cheats, press Back while playing the game and select the desired options at the cheat menu. Then, press Back to resume the game. Note: Other cheats in the cheat menu must be unlocked during the game. Alternately, hold L+ R and quickly press White, Black(2), White(2) Black at the main menu. You will have full health, unlimited painkillers, all weapons, and unlimited ammunition. The other cheats must be earned by completing the game. Alternately, successfully complete the game and unlock the rest of the difficulty levels to unlock the "All Weapons" cheat.
Pause the game, then hold L and press Black(4), X(6), Y(3), Back. When you are at the main menu, go back and a sound will confirm that the current chapter has been completed.
Pause the game and press White(2), Black, A, B, X, Y(3), R. If you entered the code correctly, a "100+" will appear next to your health bar.
Successfully complete the game on the "Fugitive" difficulty setting to unlock the "Dead On Arrival" and "New York Minute" difficulty settings.
Successfully complete the game on the "New York Minute" difficulty setting to unlock a new bonus level where you have to kill a lot of enemies, all in bullet time.
Successfully complete the game on the "Dead On Arrival" difficulty setting to unlock the Last Challenge bonus level.
Successfully complete the Last Challenge level. The doors in the back of the room will open up to the Remedy Room.
Press A to shoot, then press L to do a slow motion dive.
In the hotel, there is a room with a shotgun on a chair. When you open the door, you will have about three seconds to move or else you will get shot.
When someone throws a grenade, do a slow motion dive directly over it. If timed correctly, you will not die but still will take a lot of damage. This also works for the M-79 grenade launcher. Do not try this with a Molotov cocktail, as you will be set on fire.
When you enter a room with a tripwire trap, toss a grenade then exit the room. If you see a tripwire trap and do not have a door behind you, take out your sniper rifle and shoot it. Note: You can use any gun, but the sniper rifle/berreta is recommended as you do not normally use them very much.
When you find boxes that are not very big or steel, swing your baseball bat or lead pipe at it. This will open those boxes easily without wasting bullets.