This is game #15 in the Games on Half a Checkerboard Series. This is a game in an N-in-a-row game that turns the Mills/Morris family of games on its head. The game features the reverse winning objectives from normal games in the Mills family of games. In this game the object is for the player to remove all their pieces from the board, instead of eliminating opponent's pieces from the board, by forming a line or square. The name Sllim reflects that, as its name is the word “Mills” in reverse. Sllim also shares the form a square pattern of Square Chess, which is played in Asia.