Privacy policy – Sudoku
1. Data controller
The data controller is Dawid Orzechowski. Contact for all privacy matters: [email protected].
2. What data we collect
You don't need to sign up or give an email address or phone number to play. We don't use third-party analytics
tools. The game shows Google AdMob ads – see section 4. Our leaderboard server (sudoku.toadres.pl)
receives only:
| Data | Purpose |
|---|---|
| Anonymous leaderboard account – a random identifier (token) stored on your phone; the server keeps only its hash. | Linking scores to a player. |
| Nickname – automatic (“Gracz 1234”) or chosen by you. It is visible to other players on the leaderboard. | Showing the leaderboard. |
| Game results – level, score, time, number of mistakes and hints, daily challenge date, time the game was finished. | Leaderboard; detecting fake scores. |
| Google Play Games identifier – only if you connect the game with Google Play Games. Google confirms your identity directly; we don't receive your email address. | Nickname from Play Games and the same account on other devices. |
| App version and Android version. | Diagnostics and compatibility. |
| Anonymous sign-in statistics – once a day, whether Google Play Games is available, with a random installation identifier (we keep only its hash). | Aggregate statistics. |
| Reminder statistics – when the game showed a reminder (e.g. about the daily challenge), whether you opened it, dismissed it or played after opening it, whether a reminder was skipped (no notification permission), whether the game may show notifications and your reminder time. Reminders are created on your phone – we don't send them from the server. Events are linked to your leaderboard account if you have one. | Checking that reminders are useful and not too frequent. |
| IP address – processed briefly with each connection, not stored in the database. | Abuse prevention (rate limits). |
Game settings, the saved game in progress, score history and the challenge calendar are stored only on your phone. The leaderboard account file may be included in your Android (Google) backup if it is turned on – so after reinstalling you get the same account back.
3. Legal basis
We process data because it is necessary for the online leaderboard you use by playing the game (Art. 6(1)(b) GDPR) and in our legitimate interest in preventing fraud and abuse and in keeping aggregate statistics (Art. 6(1)(f) GDPR). Personalised ads are shown based on your consent (Art. 6(1)(a) GDPR), which you can withdraw at any time.
4. Who we share data with
We don't sell data from our server and we don't share it with advertisers. Nicknames and scores are publicly visible to other players on the leaderboard. Data may be processed by our server hosting providers – only on our behalf. Connections to the server are encrypted (HTTPS).
Ads. The game shows Google AdMob banners. The Google ads SDK collects and processes, among other things, the advertising ID, approximate location (from the IP address), device information and ad views and clicks – to show and measure ads and prevent abuse. In the European Economic Area and the UK we ask for your consent before showing ads (Google's consent form); without consent, non-personalised ads are shown. To withdraw your consent, clear the app's data (Android Settings → Apps → Sudoku → Storage → Clear data – the game will ask again; this also removes game progress stored on the phone) or write to us at [email protected]. You can reset or delete your advertising ID in Android settings. More: how Google uses information from apps that use its services.
5. How long we keep data
Account, nickname, scores and reminder statistics linked to the account – until the account is deleted. Anonymous sign-in and reminder statistics – no longer than 24 months.
6. Deleting data and your rights
You can delete your account and all scores from the server at any time: Settings → Online leaderboard → Delete leaderboard account. You can also ask us by email – see Delete account. You have the right to access, rectify and erase your data, to restrict processing, to data portability and to object, and the right to lodge a complaint with a data protection authority (in Poland: the President of the Personal Data Protection Office, UODO).
7. Children
The app is not directed at children under 13 and does not knowingly collect their data.
8. Changes
We will announce changes to this policy by updating this page and the date at the top.