Privacy Policy
InZeDoku — Android app (free and full versions) and web version · 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at every release: the check is part of the publishing procedure, and a package declaring a network permission would not be published.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 version
The version that runs in a browser, at web.inzedoku.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. One exception: if you have transferred your licence to it through a QR code, it checks it online every five minutes. That check serves the licence alone — one browser at a time — and only happens in a browser that has received one.
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. The video on the home page is loaded from youtube-nocookie.com only when you click its play button: before that click, no request is sent to YouTube; after it, playback is subject to YouTube's privacy rules.
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.
Privacy
No network permission. Verified at every release.
Not a promise but a property: the published package is checked for the absence of any internet access permission, and a package declaring one would not be published. Everything else follows from that absence.
What no network makes impossible
An advertising library needs the network and profiles you. There is none, and there cannot be one.
No usage statistics tool, no identifier, no profiling. The game does not know who you are — a logic game has no need to.
Nothing is sent anywhere. To report something, the ✉️ Feedback entry prepares a message of which you see and edit every line — and it is your mail app that sends it.
No sign-up, no e-mail address. A game travels from one device to another by a code, a QR or a sheet of paper — by your gesture, and nothing else.
The full version is paid on Google Play — €2 a year, or €10 for life. The store takes the payment: the game never sees any payment data, and there is nothing else to buy, ever.
Your games stay with you
Ongoing games, home-screen configuration and settings are saved locally. The flip side is worth knowing: uninstall the game and your games go with it — copy the state code of the ones that matter.
The camera is only requested when you scan a QR, and the image is decoded on the device by an embedded decoder. The printed document is built locally and handed to the print service.
The InZeMobile name in the About box, and ✉️ Feedback. In both cases the game hands over to the browser or the mail app: that app is the one accessing the network, not the game.
Why it is built this way
- This is how InZeMobile builds everything it publishes: no tracking, no profiling, no data leaving the device — without exception and without a version where the rule would be relaxed.
- A company that collects nothing has nothing to lose, nothing to leak, and nothing to sell.
- A deliberate bet: building a reputation on the originality and quality of what we make, rather than on what could be learned from the people who play.
- The details fit on one page: privacy policy.