Take cover and snipe your foes in Gunfight.io, a blocky, cover-based shooter. Wait for the enemy to pop up, and then pop them (or the explosive barrels that foolishly stray too close to).
WASD moves around. Duck behind cover with S. Aim down the sights of your gun with the right mouse button (which limits your vision) and shoot with the left.
Expose yourself as little as possible, or you'll get your head blown. Say in cover, and pop out only briefly to take your shot, then go back into cover. Move frequently, too, so that you don't become an easy target.