Privacy Policy

1. Introduction

This Privacy Policy describes how Quantum Craft UG (haftungsbeschränkt) ("we," "us," or "Company") collects, uses, and protects your personal information when you use the mathfiend mobile application ("App").

We are committed to protecting your privacy and ensuring transparency about our data practices. This policy complies with the General Data Protection Regulation (GDPR), German data protection laws, and other applicable privacy regulations.

2. Data Controller

The data controller responsible for your personal information is:

Quantum Craft UG (haftungsbeschränkt)

Gethsemanestr. 3, 10437 Berlin, Germany

Email: contact@quantumcraft.io

3. Information We Collect

We collect the following categories of information:

4. How We Use Your Information

We use your personal information for the following purposes:

5. Third-Party Services and Data Sharing

We integrate with the following third-party services that may collect and process your data:

6. Data Storage and Security

Your data is stored on secure servers located within the European Union to ensure compliance with GDPR requirements. We implement appropriate technical and organizational measures to protect your personal information, including:

• Encryption of data in transit and at rest
• Regular security assessments and updates
• Access controls and authentication systems
• Monitoring and logging of data access
• Employee training on data protection practices

While we strive to protect your information, no method of transmission over the internet is 100% secure. We cannot guarantee absolute security but will notify you of any significant data breaches as required by law.

7. Data Retention

We retain your personal information for the following periods:

• Account information: Until account deletion
• Game progress and scores: Until account deletion (then anonymized for leaderboards)
• Analytics data (identifiable): 14 months maximum
• Analytics data (anonymous/aggregated): Indefinitely
• Purchase records: As required by law (typically 10 years for tax purposes)
• Crash reports and logs: 90 days maximum

When you delete your account, we immediately delete or anonymize all personal data except where required by law to retain certain information (such as purchase records for tax compliance).

8. Your Rights (GDPR)

Under GDPR and other applicable privacy laws, you have the following rights:

• Right of Access: Request a copy of your personal data
• Right of Rectification: Correct inaccurate personal data
• Right of Erasure: Request deletion of your personal data
• Right to Data Portability: Receive your data in a structured format
• Right to Restrict Processing: Limit how we use your data
• Right to Object: Object to processing based on legitimate interests
• Right to Withdraw Consent: Withdraw consent for analytics and advertising

To exercise these rights, please contact us at contact@quantumcraft.io. We will respond to your request within 30 days. For data export requests, we will provide your information in a common electronic format.

You also have the right to lodge a complaint with a data protection authority if you believe we have not handled your data appropriately.

9. Children's Privacy

The App is designed for users aged 13 and older. We do not knowingly collect personal information from children under 13 without parental consent. If you believe we have inadvertently collected information from a child under 13, please contact us immediately.

For users between 13-16 in the EU, or 13-18 in other jurisdictions, we recommend parental guidance when using the App and making any in-app purchases.

10. Cookies and Tracking Technologies

The App uses various tracking technologies for analytics and advertising:

• Local storage for game progress and settings
• Analytics SDKs for usage measurement
• Advertising identifiers for ad targeting (with consent)
• Crash reporting tools for stability monitoring

You can control some tracking through your device settings, including limiting ad tracking and resetting advertising identifiers. EU users will be presented with consent choices for personalized advertising.

11. International Data Transfers

While our primary servers are located in the EU, some of our third-party service providers may process data outside the European Economic Area (EEA). When data is transferred internationally, we ensure appropriate safeguards are in place, such as:

• EU-US Data Privacy Framework participation
• Standard Contractual Clauses approved by the European Commission
• Adequacy decisions for specific countries
• Other appropriate safeguards as required by GDPR

12. Marketing and Communications

We may send you communications related to:

• Important service updates and policy changes
• Security notifications and account alerts
• Push notifications about game events (with your consent)
• Customer support responses

You can control push notifications through your device settings and unsubscribe from marketing emails using the links provided in those communications.

13. Business Transfers

In the event of a merger, acquisition, or sale of assets, your personal information may be transferred to the acquiring entity. We will notify you of any such change and ensure the new entity honors this Privacy Policy or provides you with notice of their privacy practices.

14. Changes to This Privacy Policy

We may update this Privacy Policy from time to time to reflect changes in our practices, technology, or legal requirements. We will notify you of significant changes through:

• In-app notifications
• Email notifications (if you have an account)
• Updates to this policy with a new effective date

Continued use of the App after changes constitutes acceptance of the updated policy.

15. Contact Information

If you have any questions about this Privacy Policy or our data practices, please contact us:

Data Protection Officer: contact@quantumcraft.io

Quantum Craft UG (haftungsbeschränkt)

Gethsemanestr. 3, 10437 Berlin, Germany

Email: contact@quantumcraft.io

16. Effective Date

This Privacy Policy is effective as of January 15, 2025.