Privacy Policy

Mercuro: Thermometer Logic Puzzles · Last updated: May 2026

      The short version: Mercuro can be used without an account. Your active puzzle state lives on your device. Optional Apple sync uses your personal iCloud account. The free version can show ads — one-time purchase removes them permanently.
    

Data We Store (On Your Device)

Mercuro stores your current puzzle state, solved puzzle history, solve times, streaks, settings, purchases, and unlock state locally in your device's Application Support directory.

Current in-progress puzzle grids are local-only. If you delete the app, local-only in-progress grids are removed.

Mercuro does not operate a server for your game progress.

Sign in with Apple and iCloud Sync

Sign in with Apple is optional. If you connect Apple ID, Mercuro stores your Apple user identifier locally and uses Apple's iCloud Key-Value Store to sync recoverable progress: solved puzzles, solve times, streaks, purchases, hints-used counters, and unlock state.

Mercuro does not receive your Apple ID password. Apple may provide your name or email during sign-in if you choose to share it; Mercuro stores that locally only to show account state in Settings.

You can disconnect Apple ID inside Mercuro Settings. You can remove iCloud app data from iOS Settings → [Your Name] → iCloud → Manage Account Storage → Mercuro → Delete Data.

Daily Puzzle Generation

Daily puzzles are generated on your device using a date-based seed — the same date produces the same puzzles for all players globally. No network request is made to generate or retrieve puzzles.

Advertising

The free version of Mercuro can display ads served by Google AdMob. Before ad tracking is used, Mercuro presents Apple's App Tracking Transparency prompt. If you decline tracking, only contextual or non-personalized ads are shown where supported.

AdMob may collect device identifiers, coarse location, and ad interaction information for ad serving and fraud prevention. Your puzzle progress, solve history, and grid state are never sent to Mercuro servers for ad targeting.

You can remove all ads permanently with a one-time in-app purchase.

In-App Purchases

Mercuro offers a one-time Go Ad-Free purchase processed entirely by Apple through the App Store. We do not receive or store your payment information.

Apple Game Center

Mercuro integrates with Apple Game Center for leaderboards and achievements. Game Center can receive leaderboard scores and achievement progress such as solved puzzle counts, streaks, and completion milestones. Game Center is governed by Apple's own Privacy Policy and can be managed in iOS Settings.

Analytics

Mercuro does not currently include a third-party analytics SDK for product analytics.

Crash Reporting

Mercuro does not currently include a third-party crash reporting SDK. Apple may provide developers with crash reports and diagnostics if you choose to share analytics with app developers in iOS Settings.

Notifications

If you enable Daily Reminder, Mercuro schedules a local notification on your device at 9:00 AM. Reminder scheduling does not send notification content to a Mercuro server.

Data Deletion

Deleting Mercuro removes local in-progress puzzle state and local settings from your device. Data synced through iCloud can be removed from iOS Settings → [Your Name] → iCloud → Manage Account Storage → Mercuro → Delete Data.

Children's Privacy

Mercuro is rated 4+ and is suitable for all ages. We do not knowingly collect personal information from children under 13. The App Tracking Transparency framework ensures compliant ad targeting for all users.

Changes to This Policy

If we make material changes to this policy, we will update the date at the top of this page. Continued use of the app after changes constitutes acceptance of the updated policy.

Contact

Questions about this privacy policy? support@mercuro.app