Basic Bounce-Off rules apply, but watch where you bounce these balls! Shifting weight and a tilting board add difficulty as you try to make your design. As soon as the board rocks away from you, it can rock back! Place the Game Tray on the playing surface between players. Players take the balls of their color and place them into their ball holder trays. The game begins when a player draws one of the uniquely designed challenge cards and faces it up. Each player tries to tries bounce their balls into the tray to match the design on the card. Players keep bouncing until somebody matches the design, and then that player takes the card! Bounce-Off Rock N Rollz offers tons of action packed fun that tests your skills and coordination. A Great Game for Everyone! Contains 16 balls, 4 ball holders, 1 game tray, 1 dome, 9 challenge cards and instructions.