Ultimate tic-tac-toe (also known as super tic-tac-toe, strategic tic-tac-toe, meta tic-tac-toe, or tic-tac-tic-tac-toe-toe) is a board game composed of nine tic-tac-toe boards arranged in a 3-by-3 grid. Players take turns playing in the smaller tic-tac-toe boards until one of them wins in the larger tic-tac-toe board.

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