This game is certainly one of the all time classic shooter game. The goal is to try to destroy several rows of eleven aliens that fire you and also move forward to the bottom of the screen. When the aliens get closer to you, they get faster. Try to shoot them all before they reach the bottom and complete the alien invasion. The game ends when the alien shoot all your ships or if they reach the bottom and catch you.
To move your space ship horizontally left and right use the keyboard arrow keys, press the spacebar to shoot. Hide behind the green shields from the alian shoots, try to shoot the red space ship that some times flies across the top screen, it will get you an extra bonus points.