This defense game really puts you at the center of all the action. When the game starts, you are in a defense turret in the middle of the field. Before you know it, enemies come to attack you. To shoot them, move your mouse around to change the aim of your weapon. Move the mouse to aim, and then click to fire. You want to shoot the enemies and destroy their vehicles before they kill you. To see your health and energy, push the space bar. Some vehicles will drive towards you and then stop, while others will drive straight into you and blow up.