Billy Frontier is a space cowboy with an itchy trigger finger. It is his mission to rid the galaxy of vermin, and you're going to help him!

There are 8 levels in the game, and four different types of gameplay: Duels, Shootouts, Stampedes, and Target Practice. You can play the levels in any order that you like, but be careful because you have a limited number of lives, and once you run out your mission is over and Billy goes to his grave.

When you start a new game you will be presented with the Wanted Poster screen:

Tap any of the Wanted Posters to play that level. At the bottom of the screen you will see heart icons which are your remaining lives, and next to that is your Score. When you play a level you will earn Bonus points, and if you survive that level the Bonus will be added to your Score. If you lose a level then you will not receive the Bonus points, and you will have to try that level again.