Tic-tac-toe

Tic-tac-toe was a type of Human game in which two players compete to fill in three boxes in a row within a 3x3 square grid with either an X or O.

During Lieutenant Lee Kelso's memorial service aboard the USS Enterprise (NCC-1701) in late 2265, Captain James T. Kirk mused that Kelso hated to come second to anything, even in tic-tac-toe. 

When Harry Kim referred to kal-toh as "Vulcan chess" in 2374, Tuvok commented that "kal'toh is to chess as chess is to tic-tac-toe".