Dots and Boxes is a pencil-and-paper game for two players. It was first published in the 19th century.
Starting with an empty grid of dots, two players take turns adding single horizontal or vertical line between two unjoined adjacent dots. The player who complete the fourth side of a 1x1 box earns one point and takes another turn. The game ends when no more lines can be placed. The winner is the player with the most points.