CTU - Marine Sharpshooter

Fly through walls:
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Note: This procedure involves editing a game file; create a backup copy
of the file before proceeding. Use a text editor to edit the "autoexec"
file in the game directory. Change the value of the "PlayerClip" line 
from "1" to "0".


Easy kills:
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Note: This procedure involves editing a game file; create a backup copy
of the file before proceeding. Use a text editor to edit the "autoexec" 
file in the game directory. Change the value of the "AITakeDamage" line 
from "0" to "2" for easier kills on almost all AI. 
Note: This does not work when set to "3"


Unlimited ammunition:
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Press 9 during game play. Type mpammo then press [Enter]. A sound will 
confirm correct code entry. 


Invincibility:
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Use a text editor to edit the "autoexec.config" file in the game directory.
Change the value of the "PlayerTakeDamage" line from "1" to "0". 
Note: The Spotter can still be killed.


Hints:
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Submitted by: rickHH

* Turn always run [caps lock] on!  Even with it on I find your character still
  moves way to slow but at least it's faster than walking.

* Don't forget to use your night vision goggles!  The first three stages are VERY
  dark, and even gamma correction doesn't help you too much.  Using the night
  vision goggles however makes it much easier to see, and makes missions that
  much easier to complete successfully.

* Enemies are yellow or red dots on your compass, and your partner is a blue dot.

* You fail a stage if you OR your partner dies.

* Your partner can be very stupid at times and run in front of you while you're
  sniping, as you can imagine it sucks to fail a mission for sniping your partner. 
  For the most part he stays behind you though, so you should be alright.

* In the later missions your partner can get himself killed trying to hunt down
  anything that moves, so it sometimes helps to set him so that he doesn't fire
  and stays in one spot while you take out some enemies yourself.

* When sniping you get much steadier aim the lower down you get.  By laying flat
  on the ground your aim improves the most and you're that much harder to hit, 
  so it really makes things a lot easier.

* The game autosaves for you at the start of each stage, but you can also use
  quicksave (F6) to make things easier or save (via the menu) in one of the five
  save slots as needed.  I've had the game crash on me, and I had a guard get
  stuck in a spot where I couldn't kill him once making it impossible for me to
  finish the stage.