The game of the Tic-Tac-Toe. A 15x15 board. You have to put five circles/crosses in a line (horizontal/vertical or diagonally). One point is awarded for each line of length 5. If the line is longer, for each additional field you get one point. The game ends when no new line can be created any longer. The winner is the person who scored more points. If both players have the same number of points, the winner is the first to score those points.