You start the game trying to get your first shot, which will help you get used to aiming and firing exactly where you want to. From this moment on, you have to face hundreds of different levels where you have to be faster than your enemies to successfully complete the missions. Upgrading your weapons is essential if you want to kill them with a single shot.
The goal is always the same: kill the bad guys and bring the prisoners to safety. If you can't avoid the attack, then you'll have to start over and rescue all the citizens. On many occasions you have to combine more than one weapon so your attack has the desired effect. You can't take down an armored helicopter with just a sniper rifle, for example.
Once you’ve successfully completed the mission, you'll see a somewhat bloody slow-motion replay of the the bullet hitting the targets. You can stop it by pressing the Continue button, although this is a frequent scene in Sniper 3D, as the slow motion cameras really show the quality of the graphics.