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really smart tic tac toe

A free tic-tac-toe game — play it in your browser, no install. An unbeatable AI-powered tic-tac-toe game. Minimax algorithm with alpha-beta pruning and snarky AI taunts. Can you beat it?

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

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From the README

"I never lose." -The AI

**A cyberpunk-themed Tic-Tac-Toe game with an AI opponent that uses the Minimax algorithm with alpha-beta pruning to play perfectly. Born from a kid's challenge: *"Can you make a computer I can't beat?"***

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It started with a simple question from my son: "Dad, can you make a tic-tac-toe that's actually hard to beat?"

He'd been winning every tic-tac-toe game online and was bored. He wanted a real challenge -something that would fight back, something smart.

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