Dots and Boxes

Dots and Boxes or Dots and Lines is a classic pen and paper game.

Starting with an empty grid of dots, players take turns, adding a single horizontal or vertical line between two unjoined adjacent dots.
A player who completes the fourth side of a 1×1 box earns one point and takes another turn. The game ends when no more lines can be placed. The winner of the game is the player with the most points.

It was first published in the 19th century by Édouard Lucas, who called it la pipopipette.