Nested Tic-Tac-Toe

Playable nested Tic-Tac-Toe.

This program is a game of nested Tic-Tac-Toe. The rules are the same as normal Tic-Tac-Toe except that each cell is another game of Tic-Tac-Toe. Rather than being able to pick any cell to play it, you are limited based on where the last player moved. If O plays in the top right cell of the top left game, X must play in the top right game for their move.

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