Dot Link is a strategy game and the best Dots & Boxes player on App store and iMessage.
Dot Link - Dots and Boxes
Dots and Boxes is a pencil-and-paper game for two players (sometimes more). It was first published in the 19th century by Édouard Lucas, who called it la pipopipette. It has gone by many other names, including the game of dots, boxes, dot to dot grid, and pigs in a pen. Wikipedia