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Mono Grid Duel is a monochrome three-in-a-row game in the browser: play on a 3x3 grid vs CPU (Easy, Normal, or Hard minimax) or hotseat 2P. Click cells or use keyboard numpad and arrows. About ~64 KB after Play, no install, no account.

Prefer a paddle reflex duel from another genre? Try Mono Paddle Duel.

MONO GRID DUEL

Grid duel from the open-source Cursor Arcade tictactoe module (MIT). About ~64 KB downloads once from this site when you press Play. Win counts stay in your browser.

Click cells or use numpad 7-8-9 / 4-5-6 / 1-2-3. Arrows move cursor; Enter or Space places. R restarts. Settings: 1P vs CPU or 2P hotseat.

Press Play to load the game.
Saves use ftol:monogridduel:storage.

Welcome - press Play to load Mono Grid Duel. Win counts stay under ftol:monogridduel:storage.

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Frequently Asked Questions

What does Mono Grid Duel do?

It is a three-in-a-row game on a 3x3 grid. Play vs CPU on Easy, Normal, or Hard (full minimax on Hard), or hotseat 2P on one keyboard. Mouse clicks and keyboard numpad or arrows both work.

Does it work on a phone?

The page loads on phones and you can tap cells. Keyboard shortcuts (numpad, arrows) need a desktop or laptop for full control.

Is anything saved in my browser?

Yes. Mode, difficulty, player mark, and win counts use localStorage key ftol:monogridduel:storage via the settings stub. Reset all high scores clears bests from Settings. Nothing is uploaded.

How big is the download?

About ~64 KB of HTML, CSS, and JS after you press Play. The browser caches it for later visits on the same device.

How do I play?

Click an empty cell or use numpad keys 7-8-9 / 4-5-6 / 1-2-3. Arrow keys move a cursor; Enter or Space places your mark. R restarts. Open Settings for 1P vs CPU, difficulty, and X or O mark.

Is this open source?

Yes. It is adapted from the tictactoe module in Cursor Arcade by flancast90 (flancast90/cursor-arcade-games) under the MIT license. This site build stubs the VS Code webview API and ships LICENSE and CREDITS.