Thumb VS thumb

Have you ever seen a thumb fight in the Old West? Now yes! The Saloon is invaded by many armed inches. You must act to resolve the conflict. You have to unsheathe the first in order to calm them down. Both thumbs are facing each other, button stands between them. You have to press the button to score points. But your thumb shall not be blocked by your opponent. The first to reach the score requested wins the game.