Click
in the game area with your mouse 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.