http://www.geometrygames.org/TorusGames/

This link takes you to the site where you can download Torus Games. Torus Games offers a variety of different games such as Tic-Tac-Toe, Mazes, Crosswords, Billiards, and Chess. The catch is, all of these games are played on a Torus, opposed to being played on their standard mediums. A Torus is a topological figure, similar to an inner-tube. These games foster creativity and critical thinking skills. The games can be played against the computer, or you can select the option to play against a friend. Not only is it fun to learn how to play the game, but also to figure out how the game works on a Torus.