Privacy

No account is required. Puzzle progress is stored in your browser. Clear your browser site data to remove it.

We collect basic usage events: page visits, referring site, active time, and puzzle interactions. Our Cloudflare-hosted counter uses a daily hash of IP address and browser user agent to estimate visits. We do not sell data or show advertising. The initial version has no form to collect your name or email.

The board and puzzles run locally in your browser. Puzzle source links go to Lichess, which has its own privacy policy.