Save the Solar System!One on the most popular videogames ever were Space Invaders. Extra Terrestrials is the next step after Space Invaders.
While travelling through the solar system on your way back to Earth you suddenly get attacked by Extra Terrestrials. You have to shoot down these little yellow, green and red aliens - or the solar system is doomed!
Shoot the Aliens by moving your laser guns horizontally and vertically. Use the Up/Down/Left/Right Buttons or press 2, 8, 4 and 6 to move your laser gun. Press 5 to shoot your laser gun. You have a magazine of 4 shots (the remaining shots displayed). Try to shoot the laser gun exactly over the planets to maximize your result.
After cleaning up all the space you must defend the next planet. But take care - more aliens will appear, and not all alien can be eliminated by just one shot.
yellow aliens need only one hit green aliens need two hits red aliens need three hits

Take care of your three chances, because if the aliens reach you laser gun you loose one chance, and after loosing all your chances the game is over!