The Booster. is a three-wheel, single-payline progressive slot machine game with exciting features. Before spinning, you must place a bet. High rollers who like the game of slots will like the Booster - you can bet from 1 up to 10 half dollar coins ($0.50 - $5.00) on the main payline per single spin. There is only one payline at the Booster game. The payoff for the payline is based on the coins bet.