Privacy Policy

InZeDoku — Android app (free and full versions) and web demo · Last updated: 1 September 2026

The short version fits in one sentence: InZeDoku collects no data, on any platform. What follows says exactly what that covers, how it is verified, and the few cases where an action of yours takes something off the device — always by your own gesture, never by the game.

No network permission

The published Android package declares no internet access permission. That is not an intention but a property verified at every release: the check is part of the publishing procedure, and a package declaring a network permission would not be published.

Without a network permission, the app cannot contain:

• any ad network or advertising library;
• any analytics tool, usage statistics or advertising identifier;
• any crash report sent anywhere;
• any account, identifier or synchronisation;
• any payment processing by the game — the full version (€2 a year or €10 for life) is paid on Google Play, which alone sees the payment data.

What stays on your device

Ongoing and finished games, the home-screen configuration and the settings are stored locally, and nowhere else. Nothing is sent, nothing is saved online, nothing follows an account. If you uninstall the game, that data goes with it: the publisher holds no copy.

Permissions requested

Camera — requested only when you choose to scan a game QR code, never at install time. The image is decoded on the device by an embedded decoder; no image leaves the phone. Declining blocks nothing: a code can be typed or pasted.

Printing — the printed document is built on the device and handed to the system print service, which then takes over (printer choice, save as PDF). Printing adds no permission.

What leaves the device, and only by your gesture

• Copying a game code or a state code puts a string of characters on the clipboard; you then decide where to paste it. That string describes a grid and what you wrote in it, nothing else.
• Showing a QR code displays that same string as an image, on your own screen.
• ✉️ Feedback prepares a message — category, subject, your text and a block of technical context (version, language, platform, configuration, current game code) — in a field you can see in full, edit or clear. The app sends nothing itself: it copies the message or hands over to your mail app, addressed to sudoku@inzemobile.com.
• Two outbound links — the InZeMobile name in the About box, and the Feedback entry — ask the system to open a browser or a mail app. That app is the one accessing the network, not the game.

The web demo

The version that runs in a browser, at inzedoku.inzemobile.com, loads the page once and then works locally. Games are stored in that browser's storage, on that computer; they follow neither an account nor another device, and disappear if you clear the site's data. No analytics tool is embedded.

This website

inzedoku.com is a static site: it sets no tracking cookie and embeds no third-party analytics script. Two display preferences — language and light or dark theme — are remembered in your browser's local storage and never leave it.

Children

InZeDoku is designed to be played by children, at home and in class. Since the app collects nothing, requires no account and shows no advertising, there is nothing to prepare on the school's side and nothing for parents to sign.

Why it is built this way

This is how InZeMobile builds everything it publishes: no tracking, no profiling, no data leaving the device, in every product, without exception. A logic game has no need to know who you are, and a company that collects nothing has nothing to lose, nothing to leak, and nothing to sell.

Changes and contact

Should this policy change, the new version will be published here with its date. For any question: sudoku@inzemobile.com — InZeMobile, inzemobile.com.