Privacy policy

NineLands: A Sudoku Journey. Privacy policy. Last updated: 7 November 2026.

NineLands is made by Sanjay Khatri, United Kingdom, who is responsible for the data described here. You can reach us at support@ninelands.app; for anything about your data, privacy@ninelands.app.

No account, no personal data. NineLands has no accounts and asks for no name, email, contacts, photos or location. Your progress is saved on your phone, and a copy is kept in your own iCloud account (iPhone and iPad) or Google Play Games account (Android), so it follows you to a new phone. That copy is kept by Apple or Google in your account; we never see it. Deleting the app deletes the progress from the phone; the copy in your iCloud or Play Games account can be removed in your phone's iCloud or Play Games settings. If you use your progress code (Settings → Your progress), a copy of your progress is also kept on our server under that code, so it can come back on any phone, iPhone or Android. Only the progress is kept: no name, email, phone or account, and anyone with the code can open it, so keep it safe. The copy is kept for five years after the game was last opened with the code, and Settings → Delete my saved copy deletes it at once.

Usage statistics, with your permission. To see how the game is played (for example which puzzles people leave, or how often a hint is used), the app can send counts of events like "a level was started", "a hint was used" or "a lesson was finished", with the level or lesson's name, the time, hints and mistakes on a puzzle, the app version and whether the phone is iOS or Android. Each install has a random id that is not linked to you or your phone; it is kept when progress is reset, and goes with your progress (so a phone backup restoring your progress restores it too). In the United Kingdom, the European Union, the rest of the European Economic Area and Switzerland the app asks before sending anything; everywhere, the "Help improve NineLands" switch in Settings turns it off. The service that stores these counts is PostHog (PostHog Inc.), on servers in the European Union; it is not given your IP address's location.

Crash reports. If the app crashes or meets an error, a report of what the app was doing (the error, the screen, the screens opened and the last moves made in a puzzle just before it, the app version and build, the phone model and operating system) is sent to Sentry (Functional Software, Inc.), on servers in the European Union, so the problem can be fixed. These reports carry no name, account or install id, the app sends no IP address with them, and they are kept for ninety days.

Reminders. If you switch the Daily reminder on, the app asks your phone's permission to show notifications and schedules them on the phone itself; nothing is sent anywhere.

Children. The game is suitable for everyone. It asks no one, child or adult, for personal data: what it counts and sends is described above, the same for every player.

Your rights. You can turn usage statistics off at any time in Settings. Because the data holds no identity, we cannot find yours to show or delete it; deleting the app and its backups ends any connection between you and the random id. If you have a question or a request, write to privacy@ninelands.app. Residents of the UK and EU may also complain to their data protection authority.

Changes. If this policy changes, the new version is posted here with a new date, and the app's Settings link to it.