It's a classic box-filling game where two players take turns. The game begins on a grid, and players take turns adding a line between two dots. When a player completes a square by placing the final line, they mark that square with their own color and earn 1 point. The player who completes the square gets an extra move. Play continues until all the squares on the board are filled, and the winner is the player who collects the most squares. This simple yet strategic game requires careful planning and the ability to anticipate your opponent's moves.