When you start, get the sniper. Get into sniper mode and aim at the stairs. Get your aiming perfect and snipe the guard's head. Next, snipe the guard on the catwalk in the head. Snipe the camera next to him (try to shoot the lens). Next, snipe the guard on the ground in the head. Wait at that location if he goes away, and make sure you are not seen by him. Next, move to the fence and snipe the female guard across it. Next, move between the two buildings, then aim-and-snipe at the camera. Finally, move to the upper building on the right. Aim and snipe the guard through the glass in the door. Note: If you are playing under the normal or hard difficulty setting, watch out for the hidden sniper guard when you open the door. Snipe-and-shoot the guard in the window in the dam. There will also be a guard and three cameras on the other side.