XIII - Platform: Gamecube

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.

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. 

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.