Meta-Tic-Tac-Toe – Wikipedia

Tic Tac Toe game with GUI using tkinter in Python - GeeksforGeeks

Tic-Tac-Toe – Wikipedia

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Ultimate Tic Tac Toe (Xs & Os) by Skinny128, Download free STL model

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Smart” computer opponent for the Tic-Tac-Toe game, by Claire Wang

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File:Tic-tac-toe-game-tree.svg - Wikipedia, tic tac toe game