XIII - Platform: XBox

Get the Dual Weapons skill early:
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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.

Quick gun:
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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.

Better sniping accuracy:
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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.

More ammunition:
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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.

Ubisoft logo:
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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".