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The download is a single self-contained .html file — all the markup, styling, and game logic live in one place, with no libraries or build tools.
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Source code
Tic-Tac-Toe
A classic 3×3 game with Easy, Medium, and Hard computer opponents — Hard uses the minimax algorithm and can never be beaten.
Main features
- Three AI difficulties: Easy (random), Medium (blocks and takes wins), Hard (unbeatable minimax).
- Automatic win and draw detection with the winning line highlighted.
- Pure DOM — no canvas, no libraries, no build step.
How to run it on your device
- 1. Click Download source code above to save the
.htmlfile. - 2. Double-click the file (or right-click → Open with → your browser).
- 3. The game runs instantly — no installation, no internet connection needed.
- 4. Want to peek inside? Open the same file in any text editor to read and tweak the code.