You must kill off endless waves of aliens. You do this by flying around a screen (using your rocket pack) and then shooting them with your machine gun.
People who downloaded Alien Worlds have also downloaded:
Alien Shooter, Amazing Spider-Man, The, Alien Trilogy, Arachnophobia, Alien Breed, Alien Carnage (a.k.a. Halloween Harry), Alien Cabal, Annihilator Tank
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