Welcome to Sudoku.city ("we," "our," or "us"). We are committed to protecting your privacy and ensuring you understand how your information is collected, used, and safeguarded when you use our mobile applications and website (https://sudoku.city), collectively referred to as the "Service."
Sudoku.city is designed with a privacy-first approach. We use anonymous authentication, store all gameplay data locally on your device, and do not maintain any server-side database of user data. By using our Service, you agree to the collection and use of information in accordance with this policy.
When you first open the app, an anonymous identifier is automatically generated via Firebase Authentication. This identifier contains no personally identifiable information — no email, name, phone number, or other personal data is collected or required.
The following data is stored exclusively on your device and is never transmitted to our servers:
On mobile platforms, third-party SDKs may automatically collect:
When you choose to send feedback through the app, the following information is included to help us address your inquiry: app version, platform, device model, OS version, and app language setting. This data is sent via email and is not stored in any database.
We use the collected information for the following purposes:
The Service uses the following third-party services, each of which has its own privacy policy:
Note: Premium subscribers ("Sudoku City Pass") do not see any advertisements, and advertising-related data collection is minimized for these users. The web version does not display advertisements.
All your game data (play records, statistics, achievements, settings) is stored exclusively on your device using local storage. We do not operate any server-side database that stores your personal or gameplay data.
We implement appropriate measures to protect the Service:
While we strive to protect your information, no method of transmission over the Internet or electronic storage is 100% secure. We cannot guarantee absolute security.
Since all game data is stored locally on your device:
To request deletion of your anonymous Firebase identifier, please contact us at the email address provided below.
On mobile platforms (Android and iOS), the Service displays advertisements through Google AdMob. Ad networks may collect device information and advertising identifiers to serve relevant ads.
You can opt out of personalized advertising:
Premium subscribers ("Sudoku City Pass") do not see any advertisements. The web version of the Service does not display advertisements.
Our Service is not directed to children under 13 years of age (or the applicable age of consent in your jurisdiction). We do not knowingly collect personal information from children. Since we use anonymous authentication and store all data locally, no personal information is collected from any user regardless of age.
If you are a parent or guardian and believe your child has provided us with personal information, please contact us, and we will take steps to delete such information.
Depending on your location, you may have the following rights regarding your data:
Since all gameplay data is stored locally on your device, you have full control over it at all times. For any privacy-related requests, please contact us at the email address below. We will respond to your request within 30 days.
Your information may be transferred to and processed in countries other than your country of residence through our third-party service providers (Firebase, AdMob, RevenueCat, Cloudflare). These countries may have data protection laws that are different from the laws of your country. We take appropriate safeguards to ensure that your information remains protected in accordance with this Privacy Policy.
We may update this Privacy Policy from time to time. We will notify you of any changes by posting the new Privacy Policy on this page and updating the "Last Updated" date. For significant changes, we may provide additional notice through the app.
We encourage you to review this Privacy Policy periodically to stay informed about how we protect your information.
If you have any questions, concerns, or requests regarding this Privacy Policy or our data practices, please contact us:
Email: retroxelapp@gmail.com
Website: https://sudoku.city
If you are located in the EEA, our legal basis for collecting and using your information depends on the type of information and the context in which we collect it. We process your information based on:
If you are a California resident, you have additional rights under the California Consumer Privacy Act (CCPA), including:
We do not sell your personal information to third parties.