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Click in the game area with your mouse or hit the 'S' key to start. Use your mouse to sight an approaching ship in your cross-hairs. A target box will light up when an enemy ship is in your sights, giving the craft's closing speed and range. Click the mouse button to fire.  . Whenever an enemy fighter gets past you, it will fire on your ship. You will see the screen flash and shake if they score a hit. Watch your shields - when they go, so do you.  . You can pause the game at any time by hitting the 'P' key. Hit again to resume. Use the 'M' key to toggle sound on and off.