The object of the game is to achieve the highest score by completing diagonal lines. Each turn, each player drops a piece on an empty cell. If that piece forms a diagonal line of pieces from one edge of the board to another, the player scores points equal to the number of her own pieces in that line. A single piece can complete two diagonal lines at once. The game ends when all cells are filled, and the player with the highest score wins.
Player 2 (blue) scores 6 points by playing in the highlighted cell. Two diagonal lines are completed; one with 1 blue piece and one with 5.