Piecemind Privacy Policy

This Privacy Policy applies to the Piecemind Android and iOS apps, provided by Hangzhou Zhenxu Technology Co., Ltd. under the Zhenxu Dev brand ("we", "us"), and to support communication about them.

It describes how the current released versions handle information. Where this policy differs from the company-wide Zhenxu Dev privacy policy, this policy applies to Piecemind.

Your puzzle progress, finished-game records, imported photos, settings, gem balance, achievements and favourites are stored in the app's private storage on your device. We do not upload this content to servers we operate, and we cannot read it.

Piecemind downloads puzzle catalogues and artwork images from our content delivery service and keeps copies in its cache so puzzles open quickly. Clearing the cache removes only these downloaded images; it does not delete your saves or imported photos.

Because this content is held on your device, deleting the app, clearing its storage or resetting the device may permanently remove it. Unless it has been included in a platform cloud save as described in section 5, we cannot restore it — we never received it.

Piecemind regularly downloads a puzzle catalogue — which artworks are available, daily puzzle schedules and ordering — and the artwork images you open. These requests are served by Cloudflare, Inc.

As with any internet request, this reveals your device's IP address and basic request details, such as the app version, to Cloudflare and to us. We use this only to deliver and protect the service, and we do not use it to identify you.

To find crashes and understand how the game is used, Piecemind uses Google Firebase Analytics and Firebase Crashlytics, provided by Google LLC. These services may process:

• Crash and error reports, including the state of the app at the time of the failure.
• Device and environment information such as device model, operating system version and app version.
• Usage events about gameplay, such as starting a puzzle, chosen difficulty, completion, hints, gem earnings and spending, achievements, daily tasks, downloads, sharing, sign-in and cloud sync.
• Aggregated user properties such as completion-count, best-streak and gem-balance ranges, and display or audio preferences.
• A resettable app or installation identifier generated by the service.

Piecemind does not set a user ID, does not send your platform player ID, and does not ask for permission to track you across other companies' apps or websites. On iOS, no App Tracking Transparency prompt is shown. Google processes the data on our behalf, on servers that may be located outside your country. How Google handles it is described at https://firebase.google.com/support/privacy.

On Android, the Firebase measurement SDK bundled with the app declares permissions related to the advertising ID. Piecemind does not show ads and does not use the advertising ID for advertising or to build advertising profiles. We do not sell this information.

You can turn usage analytics and crash reporting off at any time under Settings → About us → "Usage analytics". Turning it off stops both services.

Some Android builds also let the operating system back up app data, including settings and the local cloud-sync state, to your Google account. That backup is controlled by Android and your account settings, not by us.

Piecemind optionally supports Google Play Games Services on Android and Apple Game Center on iOS. Signing in is optional; all core gameplay works without it. On Android, Play Games Services may sign you in automatically when the game starts if you already use Play Games on the device; on iOS, Game Center uses the account signed in on the device.

When you are signed in, the game receives your player display name and profile picture, which it uses only to show your identity on the "My puzzles" screen, and a player identifier assigned by the platform. The identifier is kept on your device, is not sent to servers we operate and is not included in the usage statistics described in section 4.

When you are signed in, Piecemind can keep a cloud save through Play Games Services saved games (kept with your Google account) or Game Center saved games (kept in your iCloud), so that progress can be restored on a new device or after reinstalling. A cloud save may contain:

• Your gem balance, unlocked content and related reward records.
• Achievement progress, unlocked achievements and claimed rewards.
• Your best puzzle sizes, daily-challenge completion dates and the set of artworks you have completed.
• Your favourites.
• Summaries of completed games, such as puzzle size, time, moves, hints used and star rating.
• Progress on the current day's daily tasks.
• A randomly generated device identifier used only to merge progress from several devices correctly.

Games in progress are not included, and neither are photos you imported or anything derived from them, your settings or your nickname. Cloud saves are not shared between Android and iOS, or between different platform accounts.

These services are provided by Google LLC and Apple Inc. under their own terms and privacy policies (https://policies.google.com/privacy and https://www.apple.com/legal/privacy/). We do not operate this storage and cannot read your cloud save from our side.

You can switch or sign out of your account in the Google Play Games app or in the Game Center section of your device settings, and delete the saved data through your Google account's Play Games or Drive settings, or your iCloud storage settings. Piecemind has no separate account to delete. Deleting a cloud save does not remove the data on your device, and deleting the app does not remove the cloud save.

Piecemind asks for a system permission only when a feature you are using needs it, and explains the reason at the point of the request. You can decline or later revoke any permission in your device settings; only the feature that depends on it stops working.

• Photo library access on iOS, or the system photo picker on Android: used when you import a photo to make a custom puzzle. Only the photo you select is read, and it is copied into the app's private storage on your device.
• Adding to your photo library on iOS, or storage write on Android 10 and below: used only when you choose to save a finished puzzle image to your gallery.
• Vibration: used for haptic feedback during play.
• Internet and network state: used to download catalogues and artwork, and for the diagnostics and optional cloud features described above.

Piecemind does not request access to your camera, microphone, location, contacts, calendar or health data.

When you contact us for support, feedback or a bug report — for example by writing to support@zhenxudev.com — we receive your email address, your message and anything you choose to attach, such as screenshots or logs.

We use this only to answer you and to investigate the issue you reported, and we keep it no longer than needed for that purpose and for our own records of the exchange.

We do not sell personal information and we do not share it for advertising. We share information only with the service providers described in sections 3 and 4, acting on our instructions: Cloudflare, Inc. for hosting and delivery, and Google LLC for diagnostics and usage statistics.

When you use a platform game account or cloud save (section 5), Google or Apple provides that service to you directly, as an independent provider under its own privacy policy, rather than as a processor acting for us.

Piecemind is not directed at children under the age of 14. We do not knowingly collect personal information from children. If you believe a child has provided us with personal information, please contact us and we will delete it.

We apply reasonable technical and organisational measures to protect the limited information we do receive. No method of transmission or storage is completely secure, so we cannot guarantee absolute security. Content held only on your device is protected primarily by your device's own security; cloud saves are protected by the security of your Google or Apple account.

• You can turn usage analytics and crash reporting off under Settings → About.
• You can delete imported photos, individual saves and completed-game records in the app, and clear downloaded image caches in Settings.
• You can delete a cloud save through your Google or Apple account settings as described in section 5. Piecemind has no account with us to delete.
• You can revoke permissions in your device settings.
• You can ask us what support correspondence we hold about you, and ask us to correct or delete it, by writing to support@zhenxudev.com.

Uninstalling the app removes its local data but does not remove a cloud save or an Android system backup.

We intend to add optional paid features, such as subscriptions, and possibly accounts operated by us and synchronisation across platforms. None of this is active in the current released versions. Piecemind currently has no real-money purchases: gems are earned only by playing.

We will publish an updated version of this policy, with a new version number and date, describing what is collected, where it is stored and how to delete it, before any such feature becomes available to you. If paid features launch, purchases will be processed by Apple's App Store or Google Play; we will not receive or store your card or bank details.

When this policy changes we update the version number and the date shown at the top of this page. For changes that materially affect how information is handled, we will also give notice in the app or its store listing.

For privacy questions, data requests or deletion requests, contact support@zhenxudev.com. The data controller is Hangzhou Zhenxu Technology Co., Ltd..