Your games stay on your device. No account, ads, or third-party analytics SDK is needed to play.
1. Scope and contact
This Privacy Policy covers Sudoku (数独), the iPhone and iPad app with bundle identifier com.setsunal.sudoku, and its legal website. It describes the current app as of November 1, 2026. “We” and “publisher” mean the developer identified as the seller on Sudoku’s App Store listing. For privacy questions or requests, email yfeiib@gmail.com.
Sudoku works offline. It has no user accounts, advertising, third-party analytics SDK, or app-operated cloud synchronization. Normal puzzle play does not send your boards, play history, or preferences to us.
2. Information processed on your device
Sudoku stores information locally to provide its features:
- Games and imported puzzles: puzzle grids and solutions, entered digits, pencil notes, selected cells, undo and redo state, checkpoints, difficulty, and saved-game status.
- Progress and statistics: time played, start and completion dates, mistakes, hints, daily-challenge records, streaks, and achievements derived from your play history.
- Preferences: theme, appearance, text size, input mode, error highlighting, note behavior, last selected difficulty, and daily-reminder settings.
- Sharing files: a temporary image of your results may be created on your device to prepare the share preview.
Game records use local app storage, including SwiftData; preferences use the device’s preferences storage. These records are used for gameplay, resuming saved games, displaying statistics, and applying your settings. We cannot access these local records remotely.
3. Puzzle import and sharing
When you type or paste a puzzle, Sudoku validates and solves it on your device. The app receives clipboard text when you choose to paste; it does not continuously monitor your clipboard.
If you choose to share an original puzzle or a result image, the system share sheet passes the selected content to the destination you choose. That destination may send or store the content under its own terms and privacy policy. Review the content and recipient before sharing. We do not receive a copy merely because you use the share feature.
4. Optional daily reminders
Daily reminders use local device notifications and require your permission. Your selected reminder time is stored locally, and the operating system schedules the notification. Sudoku does not register for remote push notifications or send a push token to us.
You can turn reminders off in Sudoku’s Settings or change notification permission in your device’s Settings. Denying permission does not prevent you from playing.
5. Advertising, tracking, and permissions
Sudoku does not collect personal information through an account system, transmit gameplay analytics to us, use advertising identifiers, or include advertising or tracking SDKs. It does not sell personal information or share it for cross-context behavioral advertising.
The current app does not request access to your location, camera, microphone, contacts, health data, or photo library. Sharing through another app is controlled by the system and the destination you select.
6. Apple, backups, and other providers
Apple handles App Store downloads and any store payments. We do not receive your payment-card details. Apple may process store, usage, or diagnostic information under its own policies and the choices you make in device settings. Any diagnostic or aggregate information made available by Apple is handled through Apple’s developer services, rather than an analytics SDK embedded in Sudoku. See Apple’s Privacy Policy.
Sudoku does not provide its own cloud sync or server backup. Depending on your device and backup settings, Apple or another backup service you choose may include local app data in a device backup. Restoring a backup may restore older records. Those services govern their copies independently.
7. Information you voluntarily send
If you email yfeiib@gmail.com, we receive your email address, any sender name, message, attachments, and ordinary delivery metadata. We use this information to respond, investigate issues, and handle related correspondence. Support is optional; the app does not automatically attach boards, screenshots, or diagnostics.
The support mailbox uses Gmail. Google and your email provider process correspondence under their respective policies, including Google’s Privacy Policy. Processing may take place outside your country. Where applicable, we rely on the legal safeguards required for international transfers.
We use support information to handle your request and our legitimate interest in providing support; consent is used where legally required. We may retain or disclose information when necessary to meet a legal obligation or establish or defend legal claims. We do not use support correspondence for advertising.
8. Retention, deletion, and security
Local games, completion history, and preferences remain on your device until changed, deleted through available app controls, or removed with the app’s data. You can delete individual saved games from the saved-games screen; this does not necessarily erase completion history or preferences.
To remove the app’s local data, use Delete App in your device settings. Offloading the app preserves its documents and data. Backups, shared copies, files saved elsewhere, and messages you have sent are separate and must be managed with their respective providers. Temporary share images may remain until the operating system clears temporary storage or the app’s data is removed.
We retain support correspondence only for as long as reasonably needed for the request, follow-up, and applicable legal obligations. You may ask us to delete correspondence, subject to lawful retention requirements.
Device security and the operating system’s app sandbox help protect local data. Use a device passcode and manage backups and sharing carefully. No storage or communication method can be guaranteed completely secure.
9. Your privacy choices and rights
Depending on applicable law, including laws in the EEA, UK, California, India, and other regions, you may have rights to access, correct, delete, or obtain a copy of personal information, restrict or object to processing, withdraw consent where processing relies on it, and raise a complaint with a competent privacy authority. Withdrawing consent does not affect earlier lawful processing. We do not discriminate against you for exercising applicable rights.
Send requests concerning information we actually hold, such as support correspondence, to yfeiib@gmail.com. We may ask for information reasonably necessary to verify the request. Do not send sensitive identity documents unless a necessary and appropriate method has been agreed.
We cannot retrieve, export, or delete records that exist only on your device. Manage those records locally using the controls described above. There is no in-app account to delete, and no sale or advertising-sharing activity to opt out of.
10. Children’s privacy
The offline app does not ask for a name, age, child profile, or account, and does not use behavioral advertising. We do not knowingly collect children’s personal information through the app. Please avoid including children’s personal information in support messages. If a parent or guardian believes such information has been sent to us, contact yfeiib@gmail.com so we can review and delete it as required by law.
11. This website
These legal pages contain no JavaScript, analytics, forms, remote fonts, or embedded third-party assets, and do not set cookies or use browser storage.
The online pages are hosted by GitHub Pages. GitHub logs visitors’ IP addresses for security, including visits without a GitHub account. This website traffic is separate from offline gameplay. See GitHub Pages data collection and the GitHub Privacy Statement.
12. Changes to this policy
We will update this policy when relevant features or data practices change and show the revised date above. Material changes will be communicated as required by applicable law, and any required consent will be obtained before new processing begins. Downloaded copies do not update automatically.
Privacy contact: yfeiib@gmail.com.