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Memory Alpha

Tic-tac-toe is a Human game in which two players try to fill three boxes in a row within a 3x3 square grid with either an X or an O (vertically, diagonally, or horizontally).

In 2374, when Harry Kim referred to kal-toh as "Vulcan chess", Tuvok commented that "Kal-toh is to chess as chess is to tic tac toe." (VOY: "Alter Ego")

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