page_title: Ultimate tic-tac-toe
hierarchical_section_title: Ultimate tic-tac-toe
caption_attribution_description: English: An incomplete board of Ultimate Tic Tac Toe.
context_page_description: Ultimate tic-tac-toe is a board game composed of nine tic-tac-toe boards arranged in a 3 × 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. Compared to traditional tic-tac-toe, strategy in this game is conceptually more difficult and has proven more challenging for computers. It was shown in 2020 that the game admits a winning strategy for the first player to move, meaning that the first player to move can always win assuming perfect play.
context_section_description: Ultimate tic-tac-toe (also known as super tic-tac-toe,
  strategic tic-tac-toe, meta tic-tac-toe, tic-tac-tic-tac-toe-toe, or (tic-tac-toe)²) is a board game composed of nine tic-tac-toe boards arranged in a 3 × 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. Compared to traditional tic-tac-toe, strategy in this game is conceptually more difficult and has proven more challenging for computers. It was shown in 2020 that the game admits a winning strategy for the first player to move, meaning that the first player to move can always win assuming perfect play.
caption: The board of an incomplete ultimate tic-tac-toe game (the large "X"s and "O"s representing local board games that have been won by that player). The most recent move was O playing in the middle-left square of the top-middle grid, forcing X to play their next move in the middle-left grid.
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