The object of the game is to avoid the moving bar by being invisible when it passes. It is possible to play alone or in pairs, each player then represents one of the squares.
The difficulty is that when one player is displayed, the other is not.
To change state make a noise by clapping your hands or on the table where the phone is located.
You can also tap on the screen (without breaking it).
Items will also appear, some are bonuses, others are penalties!
Good luck