No accounts.
No tracking.
Sumito does not ask who you are, does not show ads, and does not use analytics or tracking cookies. Effective 9 November 2026.
What the game stores
The game saves a few small items in your browser’s local storage. They never leave your device, and you can clear them at any time in your browser settings:
- Your settings: sound effects, reduce motion, and direction buttons.
- Which first-time tips you have already seen.
- The match type you chose last.
- Your last 20 finished matches, so they stay on this device.
A service worker also keeps a copy of the game files, so the game loads fast and works offline.
Who else is involved
- Cloudflare hosts the game. Like any web host, it receives your IP address and browser details to deliver the pages and protect the site. See the Cloudflare privacy policy.
- Google Fonts serves the title fonts. Your browser requests them from Google, which receives your IP address. See the Google Fonts privacy FAQ.
- GitHub is involved only if you follow a link to the source code.
Shared replay links
When you share a match, the link contains only the opening and the list of moves. It contains no name or other personal data. Anyone with the link can view that replay.
Questions and changes
If the game later adds accounts or online play, this page will change first and will list the new data. Questions: open an issue on GitHub or get in touch through kashifaziz.me.