Click the Right Analog-stick to automatically center the crosshair at head height. This is useful on levels with lots of enemies and Xbox Live.
Better Sniping Accuracy
When in sniper mode, zoom in. To steady yourself for greater accuracy, sit there and do not touch anything to look or move for about five secounds or until he stops moving around. You can now look around with perfect dead aim accuracy.
Get the Dual Weapons skill early
In the military base level where you have to rescue general Carington, there is a door on the left that leads to some kind of bedroom just before the room with the shaft leading to Carington's prison cell. Enter the room and take out the three SPADS soldiers in the room. At the opposite end of the room to the right is a locker standing by itself. Open it to get a 9 mm pistol, and the Dual Weapons skill will be enabled. From now on you will be able to use dual pistols and miniguns.
God Mode
Press start during gameplay and press X, Y, B, X, Black, White, Left Thumbstick, Right Trigger, Y, X, Y. You will hear a gunshot if you have done it correctly. (make sure sound is turned on).
Keeping out of sight
At the start of level 13 "Dr. Freakshow, I Presume", make sure that the receptionist does not see you. If she does, the receptionist will send a lot of soldiers on you with shotguns, which is bad if you are very low on health.
More Ammunition
Wait until an enemy reloads his weapon before killing him. Kill him before he fires his gun and you will get a full magazine for your weapon.
More blood
In the level with the lifegaurd that gets shot after you get the throwing knives, kill an enemy. Then, start stabbing the dead body. Little drops of blood will appear.
Quick Gun
At the start of the game, run though the back door to a gun faster and safer than going to the man at the front. Note: Hit him in the head and he will die faster.
Strange song
Somewhere in the mental hospital level, there should be a woman in a white coat with red hair behind a desk-like object with metal grating to show that they are closed. A few are open, but you cannot get in. Get close but still remain hidden.
Listen and you should hear her singing a song that has a line like "You can close your mind but still be on the run", which the same song the "grim reaper" you must chase in hunt mode sings.
Surviving against experienced online players
Online play can be seriously difficult for those skipping the single player mode and going straight to multiplayer on Xbox Live. Experienced players seem to take a lot of hits while they shoot minimal bullets to kill you. Try the following strategies.
Get the Kevlar Vest for 100 points for extra protection.
Get five helmets for 20 points each, protect your head.
Get the M16 with grenade launcher or the submachine gun (RP-46) for maximum damage with minimal shots.
Do not stand still; move around and shoot to avoid direct hits. Also, aim for the head.
If you are low on health and body protection, detach from engaging and get your armor and health back up quickly.
Ubisoft logo
When you first start the FBI level, immediately after the woman shoots out your cuffs, go to the center of the room with the three computers. You will find the Ubisoft logo acting as a screensaver. Also, if you walk up to the computer screen, look down at it, and press A, the screen will say "GAME OVER".