Boom Blasters are rented in pairs because it is a game where players or teams compete against each other. Place a balloon on the tube at the base of the Boom Tower. Pump the Detonator, filling the balloon with air. As the pressure rises and the balloon expands, it presses into popping points on the inside of the tower's two arcs, and -- BOOM! -- there's a winner. Place two or more games side by side and you've got a Boom Blaster Challenge - first to burst wins!