Super Sniper Assassin is a great stickman sniper rifle aiming and shooting game that you can play online and for free on Slvergames.com. In every level you will have to read carefully your assignment and finish it with only one shot. Sometimes you may have to act fast or your targets will escape, so good aiming and fast thinking are key to clear level after level.
Wind and distance are going to start to kick in as you advance, but a little practice will be enough for you to master the rifle like a professional killer. Have fun with Super Sniper Assassin!