Splinter Cell - Pandora Tomorrow
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".