Privacy Policy

Robert Libsansky built the Sudoku app as a game for iOS. This service is provided as is, and this page is used to inform you about my policies regarding the collection, use and disclosure of information if you decide to use it.

The short version: the app collects no data at all, so there is nothing for me to use, share or lose.

I collect no data

The app never asks for your name, email address, phone number or any other personal information. No account and no sign-in is required.

It does not connect to the internet

Sudoku contains no networking code. Every puzzle — the daily challenge included — is generated on your device, the hints are worked out on your device, and the sounds are generated at launch, so everything works entirely offline.

No analytics, no advertising

The app contains no ad networks, no analytics frameworks and no third-party libraries that transmit anything anywhere. It links only Apple's own frameworks.

No in-app purchases

The app contains no in-app purchases and no subscriptions. Nothing in it is for sale, and no feature — the hints included — is limited by a quota or held back for payment.

Where your progress is stored

Your settings, your unfinished games, your results and statistics, your daily challenge results and your achievements are stored solely on your device, in the app's own files and the system UserDefaults store. A few puzzles generated in advance, so a new game starts instantly, are kept in the app's cache. None of this ever leaves the device. Your progress is included in your regular device backup (iCloud or computer) if you have one enabled, in which case Apple's own policies apply. Deleting the app removes this data from your device.

The clipboard

You can paste a puzzle into the Custom Puzzle screen. The app reads the clipboard only when you tap its Paste button, through the system's own paste control, and only to read the puzzle from it. It never reads the clipboard on its own.

Crash reports from Apple

If you have chosen in your device's privacy settings to share analytics with app developers, Apple may provide me with crash reports and aggregated usage statistics for the app. They come from Apple, not from the app itself, contain nothing that identifies you, and are covered by Apple's privacy policy. I use them only to fix bugs. Whether they are shared is your choice, made in your device's settings.

Device access

The app does not use the camera, microphone, location services, contacts, photos, health data or any other sensitive permission. It only uses haptic feedback and audio playback.

Children

The game is rated 4+ and is suitable for any age. Because the app collects no data, no data about anyone of any age is created.

Changes to this privacy policy

I may update this Privacy Policy from time to time. Any changes will be posted on this page with an updated date. You are advised to review this page periodically.

Contact and your rights

Robert Libsansky of Prague, Czech Republic, publishes the app and is the controller of the personal data described on this page. If you have any questions about this Privacy Policy, contact me at rob@hotmail.cz.

If you write to me, I see your email address and your message. I use them only to reply to you, which is my legitimate interest under Article 6(1)(f) of the GDPR. They stay with my email provider, Microsoft (Outlook.com), only as long as the conversation needs, and I delete them sooner if you ask. You have the right to access, correct or erase that data, to restrict its processing and to object to it, and to lodge a complaint with the Czech data protection authority, the Office for Personal Data Protection (uoou.gov.cz).

Last updated 2026-11-12 — Česká verze