You are the leader of the earths defense force and you are ready to fight against the asteroids falling upon the earth. Use your mouse to move your ship around. Your ship fires automatically. Hit the A key to upgrade your weapons. The S key will upgrade your ship. Use the D key to fire the bombs. You can also use the special slow motion option by clicking the left mouse button. Do not let any of the asteroid pass through otherwise the world will destroy eventually and you will loose. The game will also be over if you get hit by the asteroid.