Math

Ultimate Tic-Tac-Toe: The Rules

Ultimate Tic Tac Toe, also known as Nine Board Tic Tac Toe, is an interesting variation on the classic game. The board is composed of a 3×3 grid of Big Squares. Inside of each Big Square is another 3×3 grid, so there are 9 Small Squares inside each Big Square. The position you play in a Small Square then determines which Big Square your opponent can play in, and vice versa. It’s a really neat game! Can you figure out the best way to play?

This game has been popularized by Ben Orlin of MathWithBadDrawings, and this is the article where I learned about this game:

Ultimate Tic-Tac-Toe

Watch the follow-up video with a winning strategy: https://www.youtube.com/watch?v=weC1pAeh2Do

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