Privacy Policy

Last updated: May 27, 2026

Introduction

This Privacy Policy explains how VStream Technology Limited collects, uses and protects your personal data in Sudoku Battle (the "Service").

Data We Collect

• Account data: email, display name and avatar obtained via third-party sign-in (Google / Apple / Email).
• Gameplay data: match results, rank points, achievement progress, coins and match history.
• Device & usage data: device model, OS version, general usage and crash logs.
• Advertising: advertising identifiers used for third-party ads (e.g. Google AdMob).

How We Use Data

To provide and improve the Service, run matchmaking and leaderboards, prevent cheating, serve and measure advertising, and provide customer support.

Third-Party Services

The Service uses the following third parties, whose data handling follows their own privacy policies:

• Firebase (Google) — sign-in and authentication
• Google AdMob — advertising
• Cloudflare — cloud and real-time battle infrastructure

Data Sharing

We do not sell your personal data. We share data only as needed for the third-party services above, or where required by law or to protect rights.

Data Retention

We retain your data while your account is active. After account deletion, data is removed or anonymized within a reasonable period, except where law requires otherwise.

Your Rights

You may request access to, correction of, or deletion of your personal data. Email dev@vstream.tw.

Children's Privacy

The Service is not directed to children under 13. If we learn we have collected a child's data inadvertently, we will delete it promptly.

Data Security

We apply reasonable technical and organizational measures to protect your data, though no internet transmission can be guaranteed fully secure.

Changes to This Policy

We may update this Policy from time to time and post updates on this page. Material changes will be notified by appropriate means.

Contact Us

For questions about this Policy, email dev@vstream.tw.