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Tic-tac-toe, also called - Tris (in italy) ; - wick wack woe (in some Asian countries) ; - noughts and crosses (in the UK, Australia, New Zealand, South Africa, India and the rest of the British Commonwealth countries) ; - Tick-tack-toe, tic-tac-toe, tick-tat-toe, or tit-tat-toe (USA, Canada) ; - Noughts and crosses or Naughts and crosses (Great Britain, Republic of Ireland, Australia, New Zealand, South Africa) ; - Exy-Ozys, Xsie-Osies (verbal name only) (Northern Ireland) ; - X's and O's (Egypt, Republic of Ireland, Canada, Scotland, Zimbabwe, India) ; - O-X (Mauritius) ;

is a pencil-and-paper game for two players, X and O, who take turns marking the spaces in a 3×3 grid. The X player usually goes first. The player who succeeds in placing three respective marks in a horizontal, vertical, or diagonal row wins the game.