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Effective Date: July 15, 2026
Sudoku Classic: Learn & Play is published by Wonderlock Studios. This Privacy Policy explains how information is handled when you use the Sudoku Classic: Learn & Play mobile application.
1. OVERVIEW
Sudoku Classic: Learn & Play works without requiring you to create an account. We do not ask you to provide a real name, email address, password, contacts, payment information, or precise location to use the app.
The app stores gameplay and profile information locally on your device. The production Android app also uses Google Analytics for Firebase for app measurement and Google Mobile Ads for banner and optional rewarded advertisements, subject to the consent and privacy controls described below.
2. INFORMATION STORED LOCALLY ON YOUR DEVICE
The app may store the following information locally:
- Puzzle progress and saved games
- Settings and preferences
- Gameplay statistics
- Achievements
- Daily challenge records and streak progress
- Lesson, drill, and assessment progress
- Theme unlock progress
- Hint balances and gameplay-related progress
- Optional in-app profile name
- Optional in-app profile photo
- Sudoku Solver history and preferences
This information is used to provide the app’s features and personalize your experience.
Your detailed local profile, saved games, puzzle grids, profile name, and profile photo are not uploaded to Wonderlock Studios as cloud-save or account records.
The app does not currently provide cloud synchronization. If you clear the app’s data or uninstall the app, locally stored progress may be permanently deleted and cannot be restored by Wonderlock Studios.
3. FIREBASE ANALYTICS
The production Android version of Sudoku Classic: Learn & Play uses Google Analytics for Firebase to understand aggregate app usage, measure feature performance, identify reliability issues, and improve gameplay, lessons, and app design.
Firebase Analytics may process technical and usage information such as:
- A Firebase-generated app-instance identifier
- App version and package information
- Device category and device information
- Operating-system version
- Language and general regional information
- Approximate geography derived from network information
- Screens viewed
- Onboarding progress
- Game difficulty and game mode
- Whether a game was new or resumed
- Game results
- Aggregate solve time and active time
- Aggregate counts of placements, mistakes, hints, notes, and undos
- Stars earned
- Rescue and autocomplete usage
- Lesson, drill, and assessment outcomes
- Daily challenge sharing and streak-restoration outcomes
- Reminder setting and permission outcomes
- Sudoku Solver import, analysis, and playback outcomes
- Achievement, difficulty, and theme unlocks
- Rewarded-ad offer and outcome information
- Controlled operational result codes
Analytics events are designed not to include:
- Your optional profile name
- Your profile photo
- Sudoku photographs or other image contents
- Image or file paths
- Puzzle grids
- Puzzle identifiers
- Daily challenge dates
- Local game-session identifiers
- Firebase user IDs
- Support messages
- Raw error messages
- Email addresses or phone numbers
- Precise location
The app limits Firebase Analytics user properties to general progress categories, such as the highest unlocked difficulty, onboarding state, and lesson tier.
Firebase Analytics Advertising ID collection is disabled. Advertising storage, advertising user data, and advertising-personalization consent signals are also disabled for Firebase Analytics.
Analytics collection starts disabled. The app uses Google’s User Messaging Platform to determine applicable consent requirements.
Where Analytics consent is required, collection is enabled only after the required measurement and device-storage purposes have been allowed. If consent is declined, unavailable, or cannot be determined in a regulated consent flow, Analytics remains disabled and queued Analytics events are discarded.
In regions where an explicit Analytics consent choice is not required, Analytics may be enabled for app measurement in accordance with applicable law.
4. ADVERTISING
Sudoku Classic: Learn & Play uses Google Mobile Ads to display banner advertisements and optional rewarded advertisements.
The app is configured to request non-personalized ads. Non-personalized ads may still use contextual information and limited technical information for purposes such as ad delivery, frequency capping, aggregated ad reporting, security, fraud prevention, and abuse prevention.
Google Mobile Ads may process information including:
- Device and app information
- IP address
- Advertising identifiers where available and permitted
- General location inferred from network information
- Ad impressions and interactions
- Rewarded-ad completion outcomes
- Diagnostics and other technical information
Google’s User Messaging Platform is used to present privacy choices where required and to determine whether advertising requests may be made.
Rewarded advertisements are optional. A reward is granted only after the required rewarded advertisement has been completed. Choosing not to watch a rewarded advertisement does not automatically publish or share your gameplay information.
Wonderlock Studios does not provide your optional profile name, profile photo, saved puzzle grids, or detailed local profile records to advertisers.
For more information, review:
Google Privacy Policy:
https://policies.google.com/privacy
Google AdMob Privacy and Data Information:
https://support.google.com/admob/answer/6128543
5. OPTIONAL PROFILE PHOTO
You may choose an optional profile photo from your device’s photo library.If you select a profile photo, the app creates a private local copy in the app’s storage and uses it only as your in-app profile picture.
The profile photo is not uploaded to Wonderlock Studios or included in Firebase Analytics events.You can remove your profile photo from within the app.
6. SUDOKU SOLVER CAMERA AND PHOTO RECOGNITION
The Sudoku Solver can optionally use your device’s camera or photo library to recognize a Sudoku puzzle.Sudoku photo recognition runs on your Android device through the app’s native recognition module. Sudoku photographs are not uploaded to Wonderlock Studios, Firebase Analytics, or an external recognition server.
Photo paths, image contents, recognized puzzle grids, and puzzle identifiers are not included in Analytics events.You can use the Sudoku Solver through manual entry without granting camera or photo-library access.
7. NOTIFICATIONS
The app may ask for notification permission if you choose to enable Daily streak reminders.Daily streak reminders are scheduled locally on your device. The notification setting and general permission outcome may be measured through Firebase Analytics, but notification contents, Daily dates, and precise reminder times are not included in Analytics events.You can revoke notification permission through your device settings.
8. SHARING
The app may allow you to share Daily puzzle results using your device’s system share sheet.Sharing occurs only when you choose the Share action. The app does not automatically publish your results.The destination and handling of shared content are controlled by your device and the application or service you choose from the share sheet.
9. PERMISSIONS
The app may request or use the following permissions or device capabilities:
- Internet access: used for Google Mobile Ads, Firebase Analytics when enabled, consent messaging, and related online functionality.
- Camera access: used only when you choose to photograph a Sudoku puzzle for on-device recognition.
- Photo-library access: used when you choose a profile photo or select a Sudoku image for recognition.
- Notification access: used only if you enable Daily streak reminders.
- Vibration and haptics: used for optional gameplay feedback.
- Audio settings: used for in-app sound effects.
The app does not request access to your microphone, contacts, or precise location.
10. DATA SHARING AND THIRD-PARTY PROCESSORS
Wonderlock Studios does not operate an account database or cloud-save service for this app.Technical and usage information may be processed by Google when Firebase Analytics, Google Mobile Ads, and Google’s consent services are used. These services process information according to their own terms and privacy policies.
Third-party services used by the app may include:
Google Analytics for Firebase:
https://firebase.google.com/support/privacy
Google Mobile Ads:
https://support.google.com/admob/answer/6128543
Google Privacy Policy:
https://policies.google.com/privacy
Expo:
https://expo.dev/privacy
Information may also be disclosed when reasonably necessary to comply with applicable law, legal process, or enforceable governmental requests, or to protect users, Wonderlock Studios, or the public from fraud, security threats, or harm.
11. DATA RETENTION
Locally stored gameplay and profile information remains on your device until you clear the app’s data, or uninstall the app.
Firebase Analytics user-level and event-level data should be configured for a retention period of up to 14 months. Standard aggregated Analytics reports may remain available according to Google Analytics retention practices.
Advertising and consent information is retained according to Google’s applicable policies and the consent choices available to you.
If you contact Wonderlock Studios by email, your message may be retained as reasonably necessary to respond, maintain support records, prevent abuse, or comply with legal obligations.
12. YOUR CHOICES AND DATA DELETION
You can control or delete locally stored information by:
- Removing your profile photo within the app
- Disabling Daily streak reminders
- Revoking camera, photo-library, or notification permissions in device settings
- Clearing the app’s storage through Android settings
- Uninstalling the app
- Reviewing or changing available Google privacy choices through the app’s privacy-options interface
Because the app does not require an account and does not send a Firebase user ID, Wonderlock Studios generally cannot associate Firebase Analytics records with your identity or manually locate an individual Analytics record using your name or email address.
Clearing app data or uninstalling the app resets locally stored information and may reset identifiers held by the installed application. It does not necessarily remove previously aggregated or de-identified reports maintained by third-party services.
13. CHILDREN’S PRIVACY
Sudoku Classic: Learn & Play is intended for a general audience and is not directed specifically to children under 13. We do not knowingly ask children under 13 to submit directly identifying personal information through the app.
Google services used by the app may process limited technical information as described in this Privacy Policy and according to Google’s policies and applicable consent requirements. If you believe a child has provided personal information to Wonderlock Studios, contact us so we can review and address the issue.
14. SECURITY
We use reasonable measures to protect information handled by the app. Local information is stored within the device’s normal application storage. Information processed by third-party services is protected according to those providers’ security practices. However, no method of electronic storage or transmission is completely secure, and absolute security cannot be guaranteed.
15. INTERNATIONAL PROCESSING
Google and other service providers may process technical and usage information in countries other than the country where you live. Such processing is governed by the service provider’s policies and applicable data-protection mechanisms.
16. CHANGES TO THIS PRIVACY POLICY
We may update this Privacy Policy when app features, data practices, legal requirements, or third-party services change. When material changes are made, we will update the effective date and publish the revised Privacy Policy.
17. CONTACT US
If you have questions about this Privacy Policy or the app’s privacy practices, contact:
Wonderlock Studios
Email: wonderlock.studio@gmail.com
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