Privacy Policy

This Privacy Policy explains how MindStack Game ("we", "us", or "our"), an independent mobile game studio, collects, uses, and protects information when you play our games or visit our website at sizhangame.com. By using our games and services, you agree to the practices described below.

01Information We Collect

We collect a limited set of information necessary to operate and improve our games:

• Device information — device model, operating system version, screen size, and language settings.
• Usage data — gameplay sessions, levels played, feature usage, and crash reports.
• Advertising identifiers — such as your device's advertising ID, used by our ad partners.
• Game progress — saved locally on your device or with the app store account you choose to connect.

We do not collect your name, phone number, or precise location, and we do not ask for it.

02How We Use Information

We use the information described above to:

• Operate, maintain, and improve our games and their features;
• Analyze gameplay to balance difficulty and design better puzzles;
• Diagnose crashes and technical issues and keep games stable;
• Deliver and measure advertising shown in our free games;
• Detect, prevent, and address abuse, cheating, or fraud.

03Advertising & Third-Party SDKs

Our games are free and supported by advertising. We work with third-party advertising partners, such as Google AdMob and similar providers, who may collect identifiers and usage data through their SDKs to show you relevant ads.

• You can opt out of personalized advertising at any time in your device settings (e.g., "Delete advertising ID" on Android or "Ask App Not to Track" on iOS).
• Third-party ad partners operate under their own privacy policies, which we encourage you to review.
• We do not sell personal information to ad partners; identifiers are used only through these SDKs for ad delivery and measurement.

04Data Storage & Security

We apply reasonable technical and organizational measures to protect the information we handle, appropriate to its sensitivity. Data may be stored on servers operated by our service providers located in various countries. No method of transmission or storage is completely secure, and we cannot guarantee absolute security, but we work to protect your data against unauthorized access, alteration, or destruction.

05Children's Privacy

Our games are not directed at children, and we do not knowingly collect personal information from children under 13 (or under 16 where required by law, such as in the EEA/UK). If you are a parent or guardian and believe your child has provided us with personal information, contact us at sizhangame@gmail.com and we will delete it promptly.

06Your Rights

Depending on where you live, you may have rights over your personal information, including:

• GDPR (EEA/UK): access, rectification, erasure, restriction, portability, and objection, plus the right to lodge a complaint with your supervisory authority;
• CCPA (California): the right to know, delete, and opt out of "sale" of personal information without discrimination;
• Other regions: rights granted by your local data protection laws.

To exercise any of these rights, email us at sizhangame@gmail.com. We will respond within a reasonable timeframe.

07International Transfers

We are based in China, and the information we collect may be processed in China and other countries where our servers or service providers operate. Where required, we rely on appropriate safeguards for such transfers.

08Changes to This Policy

We may update this Privacy Policy from time to time. The "Effective" date at the top of this page shows the current version. Continued use of our games after an update means you accept the revised policy.

09Contact Us

Questions about this policy or how we handle information? Reach us any time: