Privacy Policy
Clean Sudoku – Offline Solver
Last updated: April 11, 2026
Introduction
Clean Sudoku – Offline Solver ("we", "our", "the app") is committed to protecting your privacy. This Privacy Policy explains how we collect, use, and share information when you use our mobile application.
Information We Collect
Information Collected Automatically
- •Analytics Data: We use Firebase Analytics to collect anonymous usage data such as app opens, session duration, and feature usage. This helps us improve the app experience.
- •Advertising Data: We use Google AdMob (Google Ads) to display advertisements, including rewarded ads (video ads you can choose to watch in exchange for in-app rewards such as hints or extra lives). AdMob may collect and process the following data for ad serving, personalization, analytics, and fraud prevention:
- Advertising ID — Google Advertising ID (GAID) on Android; Identifier for Advertisers (IDFA) on iOS (subject to App Tracking Transparency permission)
- Device information (model, manufacturer, OS version, screen size)
- IP address (may be used to estimate general location)
- App activity and ad interaction data (impressions, clicks, video views for rewarded ads)
- Crash logs and diagnostics related to ad delivery
- •Device Information: Basic device information such as device model, operating system version, and language settings may be collected through our third-party services.
This data may be used by Google to serve personalized or non-personalized ads depending on your consent preferences. For more details, see Google's Privacy Policy and Google's Advertising Technologies page.
Information We Do NOT Collect
- We do not collect your name, email address, or any personal contact information.
- We do not require account creation or login.
- We do not collect location data.
- We do not access your contacts, messages, or phone data.
- Game data (progress, settings, leaderboard scores) is stored locally on your device only and is not transmitted to any server.
Camera Permission
The app requests camera access solely for the Sudoku image scanning feature, which uses on-device ML processing. Images captured are processed locally and are not uploaded, stored, or shared with any server or third party.
Advertising & Rewarded Ads
This app is supported by advertisements served through Google AdMob, a Google Ads advertising platform. The app displays the following ad formats:
- •Banner Ads: Small ads displayed within the app interface.
- •Interstitial Ads: Full-screen ads shown at natural transition points.
- •Rewarded Ads: Optional video advertisements that you can choose to watch in exchange for in-app rewards (e.g., hints, undo actions, or extra features). Watching rewarded ads is entirely voluntary.
When ads are displayed, Google AdMob and its advertising partners may collect and use data as described in the "Advertising Data" section above. This includes using your device's advertising identifier to serve ads, measure ad performance, and show personalized ads (if you have consented). Google may also share this data with its advertising partners and measurement providers.
By using this app, you acknowledge that advertisements (including rewarded ads) are served by Google AdMob and that your ad interaction data may be collected and processed as described in Google's Privacy Policy.
iOS – App Tracking Transparency
On iOS 14 and later, Apple requires apps to request your permission before tracking you across apps and websites for advertising purposes (App Tracking Transparency — ATT).
- •When you first launch the app on iOS, you will be shown Apple's ATT permission prompt asking whether to allow tracking.
- •If you allow tracking, Google AdMob may use your IDFA (Identifier for Advertisers) to serve personalized ads and measure ad performance.
- •If you deny tracking, AdMob will serve non-personalized ads only and will not use your IDFA.
You can change your tracking permission at any time in Settings > Privacy & Security > Tracking on your iOS device.
Third-Party Services
The app uses the following third-party services, each with their own privacy policies:
Children's Privacy
The app is not directed at children under 13. We do not knowingly collect personal information from children. If you believe a child has provided us with personal data, please contact us so we can delete it.
Ad Choices & Consent
Google AdMob may serve personalized ads based on your interests and activity. You have the following choices regarding advertising:
Even if you opt out of personalized advertising, non-personalized ads may still use limited data such as general location (derived from IP address) and contextual information.
Data Retention
Since we do not collect personal data directly, there is no personal data retained on our servers. All game data is stored locally on your device and can be cleared by uninstalling the app or clearing app data.
Changes to This Policy
We may update this Privacy Policy from time to time. Any changes will be reflected by updating the "Last updated" date above. Continued use of the app after changes constitutes acceptance of the updated policy.
Contact Us
If you have any questions about this Privacy Policy, please contact us at:
Email: contact@fishtailgames.com
Developer: Fishtail Games
This privacy policy is effective as of April 11, 2026.
This app is developed by Fishtail Games.