Tic-tac-toe, noughts and crosses, or Xs and Os, is a paper-and-pencil game for two players,
X and O, who take turns marking the spaces in a grid.
To win the game, a player must place three of their marks in a horizontal, vertical, or diagonal row.
X and O, who take turns marking the spaces in a grid.
To win the game, a player must place three of their marks in a horizontal, vertical, or diagonal row.