Cowboy vs Martians Home Cowboy vs Martians 0.0 / 5 ( 0 votes ) Your Rating? Discover Cowboy vs Martians – Play Free Now on WebGameFree! You’re the great old cowboy and those pesky martians have invaded your territory. Use your trusty pistol to shoot them all. Use fewer shots to get a higher star count. This game will test both your reflexes and brains. Categories in which Cowboy vs Martians is included: Board Ball 1 Player