What happens with your data

This policy explains what the Sudoku Zen Diari iPhone app does with your information. In two lines: we ask you for nothing, everything you play stays on the phone, and the only things that leave it are what the ads need and, if you want it, Game Center.

Who is behind it

The app is made and maintained by Jordi Vicedo, an individual developer based in Spain. For anything about this policy: jordi@vicedo.cat.

What we don't do

There are no accounts and no sign-up: we don't ask for your name, email or phone number.
We run no servers of our own. There is no database of ours holding anything you play.
We run no analytics: we don't measure what you do inside the game.
We don't sell or share data with anyone.

What is stored about your game

The app keeps on your phone:

The game you have in progress.
Which daily challenges you've finished, and your streak.
Your total points and best times per difficulty.
Your settings: skin, mistakes allowed, hints, visual helpers, haptics and sound.

A copy of that goes to your own iCloud, so that changing phones — or deleting the app and installing it again — doesn't cost you your progress. The copy lives in your Apple account, not on any server of ours: we have no access to it and cannot read it. With no iCloud account on the phone the game works exactly the same, and the data stays put.

Part of it also goes to Game Center, if you're signed in: your total points and your streak, which are what the leaderboards are made of. Nothing else — not the game in progress, not your best times, not your settings.

To remove all of it: deleting the app takes away what's on the phone, and the cloud copy is removed from iOS Settings, under "Apple Account → iCloud". Game Center scores are managed from Game Center itself.

The app is free and paid for by a Google AdMob banner, which never appears while you play (only on the home, challenge and ranking screens, and when a game ends).

To serve them, the Google component bundled in the app receives information about the device:

The device advertising identifier, if you allowed it.
The IP address, which yields an approximate location (city or region, not your street).
The model, system version and technical details of the device.
Which ads you saw and what you did with them.
Diagnostic data: app crashes and performance.

We see none of it: all we get from Google is an aggregate report of how many times the banner was shown and how much it earned.

How Google handles that data is theirs to explain:

What you choose

Two things happen the first time you open the app:

Google's consent form (required in the European Union), where you choose whether to accept the uses the ad providers propose. You can say no and carry on playing.
The iOS tracking prompt. If you say no, the app doesn't access the advertising identifier and the ads you see won't be personalised. You'll still get ads, just generic ones.

Both answers can be changed at any time: the tracking one lives in the iOS Settings app, under Privacy & Security › Tracking.

The app also uses SKAdNetwork, Apple's system for measuring whether an ad campaign works without identifying anyone.

Game Center

Game Center is optional and run by Apple. If you're signed in, the app sends your total points and your streak to the leaderboards, where they appear under the nickname you chose in Game Center. We store none of it: it lives in your Apple account.

Signed out, the game works the same and the ranking screen shows only your local records. What Apple does with Game Center data is in Apple's privacy policy.

The App Store

Apple gives us aggregate, anonymous statistics about downloads, versions and crashes. They're numbers, not people: they can't identify anyone.

Children

The app is not directed at children under 13 and asks them for nothing. If you are a parent or guardian and believe a child in your care has provided personal information through the app, write to us and we'll look into it.

Your rights

Since we hold no data about you, there is nothing of ours to show you, correct or delete: to remove everything there is, delete the app from your phone.

For advertising data, the party processing it is Google: you can exercise your rights of access, rectification, erasure, objection and portability with them through the means set out in their policy. You can also withdraw consent inside the app or turn tracking off in iOS settings, as described above. And you can always complain to the data protection authority in your country.

If anything here is unclear, write to jordi@vicedo.cat and I'll answer.

Changes to this policy

If the app changes in a way that affects what this page says, we'll update the page and the date below. It's worth checking back now and then.

Last updated: 24 August 2026.