A mask on your head? Only when you set it up do you see the secret; there is a marble path on the inside! By playing the game, others see you moving.
So you think you can't dance? Everyone can dance! The marble path in the box is your choreography. There are in total 3 different choreographies.
Two people compete for the fastest time on a black-and-white dance floor. Whoever leads the coin first through the lane has won.