There is a large 3*3 board with smaller 3*3 boards in each section. Win in the smaller boards to make your mark on the larger one.
Successive turns must be played in the section of the larger board where the previous move was made in the smaller board.
If a move can not be made in the section, if the section resulted in a win or a draw, the player may play anywhere.
The game tells you where to play by dimming the other sections, not allowing you to play in the wrong section and displaying a message.
O begins and can play anywhere.