Numerical Alchemist / 数の錬金術師
Privacy Policy
Last updated: March 7, 2026
1. Information We Collect
We may collect the following information to provide core features and prevent abuse.
- Authentication data: login identifiers used via Firebase Authentication (for example, Google account identifier)
- Profile data: display name, photo URL, and email address when available
- Gameplay data: progress, scores, achievements, settings, created stages, and published stage data
- Purchase-related data: identifiers needed to verify full edition purchase status
- Technical data: device and log information required for troubleshooting and service quality
2. How We Use Information
- Provide account features, sign-in, and data synchronization
- Maintain gameplay progress, achievements, and related experiences
- Provide community features such as publishing, browsing, and likes
- Verify purchase status and provide billing-related features
- Prevent abuse, improve quality, and provide support
3. Third-Party Services
We may use the services listed below. Each provider handles data according to its own privacy policy.
- Google Firebase (Authentication / Firestore / Hosting and related services)
- Google Play Billing (purchase flow and purchase verification)
4. Data Retention
We retain information only for as long as necessary to fulfill the purposes described in this policy. Unless legally required otherwise, unnecessary data is deleted or anonymized within a reasonable period.
5. Your Choices
- Some features are available without Google account linking by using local storage.
- For account-linked data deletion requests, contact us through the developer contact channel below.
- Deletion request page: /en/account-deletion
6. Contact
For privacy questions or personal data requests, please contact us through the developer contact listed on the app distribution store page.
7. Changes to This Policy
We may update this policy as features or legal requirements change. Updates become effective when posted on this page.
Japanese version: /privacy