If you want to invisible while on plying i will giving a new cheat code. Open project igi installation folder and make a text file and type- auto type PROJECT IGI = Cheat 342343 =invisible. If you complete save it with extension as.qvm. On plying open the main window and type it.

Project IGI
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New Cheats and Hints
at
http://www.cheatchannel.com
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CheatMode:
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On the Main Menu type 'Nada' and then when you are in
the game type in these cheat codes:

Code Result
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allgod - Make You and team God mode
allammo - Unlimited Ammo
easy - I think to make Level easy
ewww - Make Enemys die

Hints:
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When you're at the water tower after you kill the sniper
there is a rope over to the right of where the sniper just
was and if you look up toward's the rope it will indicate
that you can use the rope.

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How to stop detection from Security cameras with one bullet.

1. Go to the water tower once you have killed two guys in the
communications room

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2. turn off the cammeras in the next room and go up the water
tower.[using the computers and the 'shift' key]

3. kill the guy. [he shouldn't see you, just sneek up and knife
him from behind for fun].

4. get his gun and use the scope to find all the camers.[you will
want to turn the alternate fire key to 'right click'] {this way
u can use the scope by clicking 'right click' and use page up or
down to zoom in and out}.

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5. then simply track down the cameras and one shot from the sniper
rifle should blow them up.[or u can shoot the people in the garage
area and the two guards outside there [one in the tower and one
just to the lower right]

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6. this way you only have to go back into the room were you turned
off the camers first time, do it again and go around shooting
them with any other gun to blow them up.