Use the mouse to move your ship (the black circle). Use A and D to rotate the barrel of your laser gun, and click the mouse to shoot. The government has sent explosively hot air balloons to destroy your mothership. Shoot the balloons before they reach the mothership, and don't let them touch you. When either you or the mothership runs out of health, you die. You must try and get the highest possible score before then. Score is increased by destroying enemies and by staying alive. Hitting multiple enemies in one shot is better. Score is decreased by losing health, the mothership losing health, and missing shots. When you shoot a battery, the mothership gets enough power to send down a beam which pushes down balloons.