Use your mouse to sight an approaching ship in the cross-hairs. A target box will light up when an enemy ship is in your sights, giving the enemy 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 it scores a hit. Watch your shields - when they go, so do you
A 200mHz or faster system is recommended. It helps if you use a browser with a JIT (just in time) Java compiler. You can enable JIT in your browser's Java settings. Turning off the sound effects may increase game speed.