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.