Tic-tac-toe (also known as 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 3×3 grid. The player who succeeds in placing three of their marks in a horizontal, vertical, or diagonal row wins the game. Actually, you don't need paper and a pencil. All you need to do is installing this APP and enjoying the game. Disclaimers: Opponent is not included in the APP.