Fulfil your responsibility towards the nation and eliminate terror. You have been ordered to shoot terrorists. Point at them and shoot.
At the beginning of the game, you will be in observation mode when you can look through your scope to have an overall view of the barrack layout. Once you are ready you can click on .SNIPE. click to start the level. Among all the snipers in the level only one will be spotting you at a time. You will get 15 seconds to find the sniper aiming at you.
Aim using your mouse, once you have the enemy in sight click to shoot.