Privacy Policy
Last updated: 2026-11-10
Game data
Games run on your device. Your current game, best scores and theme choice are stored in your browser's local storage on that device only. Apart from leaderboard results (see below), they are not sent to our servers. Clearing your browser data removes them.
Site statistics
When a page opens, and when a game is started or won, the page sends a short counter message to our own server containing only the page or game name and, for games, the mode (for example "sudoku / hard"). We use these counts to see which games are played and where they need work.
To count daily visitors, the server derives an anonymous identifier from a one-way hash of the day, a secret value, the IP address and the browser's user-agent string. The IP address and user-agent themselves are not stored, and the identifier changes every day, so visits on different days cannot be linked. We also store the country, as determined from the IP address of the visit, and the device type (desktop, mobile or tablet). No cookies are set on visitors for this. This site includes GeoLite Data created by MaxMind, available from https://www.maxmind.com.
World leaderboards
To take part in the leaderboards without an account, your browser creates a random code and keeps it in local storage. When you finish a ranked game, the page sends this code with the result (for example your score and move list, or your answers for a daily puzzle). The server stores only a one-way hash of the code, never the code itself, together with your best result, the time it was set and the country, as determined from your IP address at the time. The server also records when you started a daily puzzle to measure your time.
Leaderboards are public. They show your rank, your result, a country flag and, if you chose one, your display name; otherwise "Anonymous". Do not use your real name if you don't want it shown. You can change your name at any time. Clearing your browser data removes the code, so a new browser starts as a new player. To have a name or result removed, email us.
Contact form
Messages sent through the contact form are stored on our server with the time, the page it was sent from, the country and device type, and the email address if you provide one. They are used only to read and reply to your message.
Accounts
Zippi has no accounts and does not ask for your email to play. A display name is optional and used only on the leaderboards.
Analytics and advertising
We may use Google Analytics to count visits and Google AdSense to show ads. These services can set cookies and collect information such as your IP address, browser type and pages visited. Google's use of this data is described at policies.google.com/technologies/partner-sites. Where required by law, you are asked for consent before these cookies are set.
If you email us, we use your message and address only to reply.
Children
Zippi is a general-audience site and does not knowingly collect personal information from children.