Vietcong - Purple Haze - Platform: XBox

God mode:
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Press L + R + A + Down during game play.

Sniper rifle:
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Always use a snipers rifle. This seems to work the best, because you can stay low 
and pick your targets. If it gets too hot, send your team. If you tell them to 
spread out, it works better than an attack.

Shooting difficult to hit far away enemies:
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Look at the enemy through binoculars. Center the enemy in your binocular sights, then 
switch back to your rifle. The rifle will now be trained on the enemy. Fire a three 
round burst and you will usually take him out.

Level select:
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Highlight the "Options" menu, then hold L + R + Black + White