It is another time for aliens to attack our mother earth. They are very persistent and the government has exhausted all their resources to eliminate the threat. But to their dismay the enemies just keep coming. Without any options left, they turn to the professional UFO killer. With the ability to create weapons that can obliterate alien ships without breaking a sweat, this hired gun is ready to go into action as long as the money is good. With all the funding diverted to the mercenary’s pocket, it’s now time to play with the annoying aliens. The ship now flies just beyond the earth’s orbit and waits for the incoming ships. You can control the spacecraft below the screen by using the arrow keys. Enemy forces will be hovering at the top of the screen. To shoot at them, press the spacebar. You have limited ammo so try to make each shot count. Time their movement with your shot so that no bullet gets wasted. On the right side of the screen, the number of enemies needed to be destroyed is displayed. You must get at least 75 percent of that amount to move on to the next level. UFOs will stop showing up after a while and this indicates the end of the level.