Ultimate Tic Tac Toe vs AI
Nine games of tic tac toe in one. Win three small boards in a row.
How to play
The board: nine small tic tac toe boards, set out as one big tic tac toe board. X goes first, then the players take turns marking one empty square.
Where you play: the first move can go anywhere. After that, the square you mark sends your opponent to the matching board: mark the top-right square of any small board, and your opponent must play in the top-right board.
Small boards: three in a row on a small board wins it. A small board that's won, or full without a winner, is closed: nobody plays there again. If you're sent to a closed board, you may play in any open board.
Winning: win three small boards in a row, across, down or diagonally. If every board closes without that, it's a draw.
Tips: you can play in the highlighted board. Point at a square to see which board it would send the computer to; a square marked ★ wins the game. Undo takes back your last move, and the computer's reply.