Press R, L, Up, Down, A, Up, X, A during game play.

When at your home area with the shed of guns, you may shoot down the birds either on the ground or while they fly in the air. Each bird that is shot will fall to its corresponding area and remain there until you leave the level. You can also shoot the pigs in their pen.

In order to fight the Boss, you have to eliminate all of the hitmen. This will make the Boss battle much easier. When you have killed all of the hitmen, enter the confession room on the left. This is the one that you pray in during the first level;s loading screen. The priest will be in the confession room directly next to you, being held captive by the Russian general. The only way to get the general out is to crouch down and shoot a bullet at the heart on the confession booth's inside wall. A short intermission will start and the general will come out, firing an SP12. Use any automatic rifle and fire, making sure every bullet connects. Make sure you have the full amount of ammunition equipped in the gun. He should die within a few seconds.

Press R, L, Up, Down, A, Up, White during game play.

In order to fight the Boss, you have to eliminate all of the hitmen. This will make the Boss battle much easier. When you have killed all of the hitmen, enter the confession room on the left. This is the one that you pray in during the first level;s loading screen. The priest will be in the confession room directly next to you, being held captive by the Russian general. The only way to get the general out is to crouch down and shoot a bullet at the heart on the confession booth's inside wall. A short intermission will start and the general will come out, firing an SP12. Use any automatic rifle and fire, making sure every bullet connects. Make sure you have the full amount of ammunition equipped in the gun. He should die within a few seconds.

When playing in any level, just run or sneak up to an enemy and fight him with your fists. He will soon be out cold. Once he is, use any gun to shoot him anywhere on his body. He will not get back up.

Press R, L, Up, Down, A, Up, Down during game play.

The .22SD is well hidden in the castle level where you have to kill Hayamoto senior. It is one of the items that is displayed in his museum.

The .22SD does not trigger metal detectors. It is useful in the Basement Killing level.

On the motorcade level, you need to clear the town quickly and grab the supplied rifle. Shoot your target. This will cause the UN guards to stop and run on foot to your position. Wait until they get through the gates, then dodge their shots and put them in the cross fire from the remaining troops outside. Since you cannot hurt them, do not shoot. They will soon shoot their own men. Then, just run up and grab an M4. This may not be easy, but it does work.

To get the M4 easier, just use the fiber wire on the UN guards.

Press R, L, Up, Down, A, R, L, Black, White during game play.

Throughout all the levels you will run into many different types of guns. Whenever you see a gun that you do not already have, pick it up. After you complete the level on which you found the gun, the gun will now be available at your house. You will have ammunition in the room for you to use if desired. However, there are many guns that are too big to carry inside your clothes and therefore must be held in the open. You will not be able to pick up a gun of the same size or greater without dropping the one you are holding. You will find other guns on the same level that you cannot pick up because you are already holding one, and the gun you want is simply too big to conceal. In this case, you will have to decide which gun you want more then finish the level with it. You can always replay that level to get the other gun that was left behind.

When holding the Uzi, take out the Ballers. The Uzi will be fully holstered, like a pistol.

Press R, L, Up, Down, A, Black, White during game play.

Press R, L, Up, Down, X, Y, B at the main menu.

Press R, L, Up, Down, A, R(2) during game play. Restart the level to remove its effect.

If you are near a stack of ammunition but are notified by the game that you cannot pick it up, use the following trick to get almost twice as much normal ammunition. For example, if you have a shotgun with full ammunition and are next to a pile of shotgun ammunition, fire one shot, reload, then pick up the ammunition. You will now have almost double the ammunition.

Press R, L, Up, Down A, White(2) during game play. Weapons will pin people to walls when this code is activated.

Pick a lock, look at your map, and exit. The lock will be picked.

Press R, L, Up, Down, A, Up(2) during game play.

Change to first person view and use the knife. You can attack while running if you press the [Attack] many times.

Successfully complete a level with a "Silenced Assassin" rank twice.

Successfully complete a level with a "Silenced Assassin" rank.

Press R, L, Up, Down, A, Up, L during game play.

Enable the "Nailgun mode" code and pin a person to the wall. Try to drag them and their arms will stretch like elastic.

Press R, L, Up, Down, A, L(2) during game play.