How to Play
The game board is made up of one large 3x3 grid with smaller 3x3 grids in each of its cell.
To win you must complete a row, column, or diagonal of the big grid with your symbol.
To win each of these big cells you must complete a row, column, or diagonal of the small grid inside it.
Two players take turns to select a small cell; their symbol is put into that cell.
The cell a player chooses must be in the same big cell of the overall board as the small cell chosen by their opponent on their last turn.
The player who goes first can go anywhere.
If a player chooses a small cell whose corresponding large cell has been won by a player or is full, the next player can choose any small cell on their following turn.