Join five
Two-player paper-and-pencil game / From Wikipedia, the free encyclopedia
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Join five (also known as morpion solitaire, cross 'n' lines or line game) is a paper and pencil game for one or two players, played on a plus-shaped grid of dots. The origins of the game are probably in northern Europe. References to the game first appeared in French publications in the 1970s.[1] In addition to being played recreationally, the game has been the subject of theoretical studies[2] and computer searches for solutions.[3]