In Cowboy vs Martians you have to defend your domain against Aliens. Load your gun and take the aliens out of the desert. Use your abilities and finish off any number of them as would be wise to get them out of the wilderness for good. The Martians have arrived on Earth, and in Cowboy vs. Martians you have to save the world. Armed with a firearm, you must fire all the Martians before they cause trouble. The game starts out efficient before getting steadily harder with each level. There are three stars available for everyone in each level and the less pictures you take, the more stars you get - you'll have to try over and over to get them all!