Tic Tac Toe

Tic-tac-toe (American English), noughts and crosses (British English), 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. RULES FOR TIC-TAC-TOE 1. The game is played on a grid that's 3 squares by 3 squares. 2. You are X, your friend (or the computer in this case) is O. Players take turns putting their marks in empty squares. 3. The first player to get 3 of her marks in a row (up, down, across, or diagonally) is the winner. 4. When all 9 squares are full, the game is over. If no player has 3 marks in a row, the game ends in a tie.