Easier aiming with pistol - To aim better with the pistol, press B to pull it out. The crosshair should appear normal. Then, press Up on the D-pad and the crosshair should become a laser sight. This makes it very easy to aim, since the laser sight is smaller and thinner than the normal crosshair. This allows fast kills and head shots. Note: If you are in dark corners and have the laser sight on, the enemies will notice and attack you.

Knocking out guards - To knock out a guard without using a Sticky Shocker or a Air Foil, shoot a Sticky Cam at their head. Note: It must hit him directly in the head for the guard to get knocked out.

Stealth - To move quieter, crouch down and walk slower. This will make your steps softer, and keep you undetected to a limit. To decrease your chances of being seen, shoot out the lights with your gun. Be careful, as if there is an enemy is under that light they may see you shooting it out.

Bypassing motion detectors - Before passing by a motion detector, pick up the body of a dead or unconscious guard. Then, proceed to walk past the motion detector. The motion detector should not go off, due to it seeing the guard on your shoulders, thus making you invisible to it.

Find mines easily - In order to find mines in the camp mission, turn on the thermal vision.

Whistling - Whistle and this will usually make a guard approach the sound. Note: Hide in a dark area and whistle, then jump the guard when he stops.

Talking to teammate after losing in multi-player mode - When you are playing in an online match and lose all of your respawn lives, mute your teammate and then unmute him. Both of you can now communicate with each other.

Level select - When you complete the game on the normal or hard difficulty setting, when you go back into the game make sure you go over towards the level select instead of checkpoints. You could lose your data and have to do it over again if the wrong choice is made.