Play Cowboy vs Martians Online Game. One of many Puzzle Games to play online on your web browser for free at KBH Games. Tagged as Kids Games, Physics Games, and Puzzle Games. Cowboy vs Martians Game App is also available for your iPhone and iPad on the Apple App Store. Upvoted by 13 players. Other games you might like are Cowboy Duel and Save the Cowboy. No download or installation needed to play this free game. Hope this game brings a little joy into your daily life.