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1. The game is played on a grid that's 3 squares by 3 squares.
2. You are X, your opponent is O. Players take turns putting their marks in empty
3. The first player to get 3 of her marks in a row (up, down, across, or diagonally) is
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.