Splinter Cell - Pandora Tomorrow - Platform: XBox

Hints:
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When you don't have your rifle yet and you can only use 
your gun (like in the first mission) click the right 
thumbstick to use your binoculars, use the crosshair to 
aim at the item you plan to shoot, click again to go back 
to normal view (do it gently so not to change your position) 
now whip out your gun and shoot, if done correctly you can 
hit lights from across the room :D

Second one is very handy, when hiding in a room for an alerted 
guard use your optical camera to view the other room, now when 
the guard comes to check out the room, he won't be able to open 
the door because you're using the camera, instead of freaking 
out and sounding the alarm he'll try a few times and walk away 
with a "it must be nothing".