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really dummy tic tac toe

A free tic-tac-toe game — play it in your browser, no install. The world's worst AI tic-tac-toe — uses Minimax algorithm BACKWARDS to find the worst move every time. Self-deprecating taunts, cyberpunk vibes, and guaranteed wins. The evil twin of Really Smart Tic-Tac-Toe.

by @williankeller · williankeller/really-dummy-tic-tac-toe on GitHubLANG HTMLHOSTED ON WILLIANKELLER.GITHUB.IOUPDATED 12 Apr 2026

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From the README

"I believe in myself... kinda." -The AI

The evil twin of Really Smart Tic-Tac-Toe. This AI uses the same Minimax algorithm -but runs it backwards to find the worst possible move every time. It's not just bad. It's professionally bad.

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After building an unbeatable tic-tac-toe AI with my son, he asked the question every great scientist asks: "What if we made it really, really dumb?"

And honestly? It was an even better idea.

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