ticktacktoe, ticktacktoo, tick-tack-toe, tic-tac-toe, tit-tat-toe, noughts and crosses(noun)

a game in which two players alternately put crosses and circles in one of the compartments of a square grid of nine spaces; the object is to get a row of three crosses or three circles before the opponent does

tic-tac-toe(Noun)

A game in which two players take turns putting circles and crosses on a 3x3 grid and try to get three of the same symbols in a line