Few pencil-and-paper diversions are as easy and beloved as Tic Tac Toe, also known as Noughts and Crosses or Xs and Os. The game is a paired zero-sum challenge played on a 3x3 board , where individuals take turns placing their symbol —either an "X" or an "O"—in an unoccupied space . The goal is to be the leading person to form a row of three sy