# Privacy Policy — Sudoku
_Last updated: 14 September 2026_
BT Developer ("we", "us") operates the
Sudoku mobile application (the "App"). This policy explains what data the
App processes and why.
This policy is provided in English only.
## Summary
The App works fully offline. We do not operate a server, we do not
require an account, and we do not collect your name, email address, or
any other information that identifies you personally. The only data
processing that happens is what is needed to show advertising, to process
an optional one-time in-app purchase, and — in regions where the law
requires it — to record your advertising consent choice. All of that is
handled by Google's own SDKs, not by code we wrote.
## Information we do not collect
- No account or sign-in. The App has none.
- No name, email address, phone number, or postal address.
- No access to contacts, camera, microphone, photos, or precise location.
- No user-generated content. Nothing you enter in a puzzle is sent
anywhere.
## Information stored only on your device
The App saves the following using standard Android and iOS app storage.
It is never transmitted to us, because we have no server to send it to:
- Your app language selection
- Your appearance choice (system, light, or dark)
- Your selected difficulty
- Puzzle progress: the digits and pencil marks you have entered, which
puzzles you have completed, and how long you have spent on the puzzle
you are currently solving
- Sound effect, vibration, and background music preferences
- Whether play reminders are switched on, and the time you last opened a
puzzle (used only to decide whether to send that reminder)
- Whether you have purchased Remove Ads
- Whether you have completed first-time setup
Uninstalling the App deletes all of it.
## Notifications
**Play reminders** are on by default. If you have not played for a
couple of days, the App schedules a single reminder on your device to
nudge you to come back. These notifications are generated entirely on
your device. There is no push service, no server, and no device token is
created or transmitted.
Because the reminder is on by default, the App asks for your device's
notification permission the first time you use it. If you decline, no
reminder is scheduled and the setting stays off. You can switch play
reminders off at any time from **Settings**, which also cancels any
pending reminder, and your choice is remembered — an update will not
switch them back on.
## Information processed by third-party services
### Advertising — Google AdMob (Google Mobile Ads SDK)
Unless you have purchased Remove Ads, the App shows banner,
interstitial, and rewarded video ads through Google AdMob. To do this,
Google's SDK may process:
- Your device's advertising identifier, subject to your device's ad
tracking settings
- Approximate location derived from your IP address, for ad relevance
and fraud prevention
- Device and app information such as device model, operating system
version, and app version
This processing is governed by Google's Privacy Policy
(https://policies.google.com/privacy) and, for ad personalization
specifically, Google's Ads Privacy & Terms
(https://policies.google.com/technologies/ads).
Ads require an internet connection. Playing puzzles does not.
### Advertising consent — Google User Messaging Platform
Where the law requires it — for example for users in the European
Economic Area, the United Kingdom, or Switzerland — the App uses Google's
User Messaging Platform to ask for your consent before showing
personalized ads. This determines your approximate region, in order to
know whether consent is required, and stores your choice. You can change
that choice at any time from **Settings → Ad privacy options**.
No ad is requested, and the advertising SDK is not started, until that
consent step has completed.
### Purchases — Google Play Billing
The optional "Remove Ads" purchase is a one-time purchase processed
entirely by Google Play Billing. We never see or store your payment card
details; those are handled by Google Play. We receive only confirmation
that the purchase completed, which is stored on your device so the App
knows to stop showing ads.
### Analytics
The App does **not** transmit analytics. Product events such as "puzzle
completed" are written to the local debug log during development only,
and no analytics data leaves your device.
If this ever changes, this section and the Google Play Data Safety
declaration must both be updated to name the provider and state what it
collects.
## Age requirement
The App is intended for users aged 13 and over. It is not directed at
children under 13, and its Google Play target audience is declared
accordingly.
We do not knowingly collect personal data from anyone, including
children: the App has no account, and it does not collect names, email
addresses, phone numbers, or any other information that directly
identifies a user.
If you are a parent or guardian and have questions about the App's
privacy practices, contact us at baladream.help@gmail.com.
## Legal basis for processing (GDPR)
We are established in Finland, so the EU General Data Protection
Regulation applies to this App.
- **Personalized advertising** is processed on the basis of your
**consent**, collected through Google's User Messaging Platform before
any ad is requested. You may withdraw it at any time from
**Settings → Ad privacy options**; withdrawal does not affect
processing carried out before you withdrew.
- **Non-personalized advertising and fraud prevention** rely on our
**legitimate interest** in funding a free app, balanced against the
limited data involved.
- **Your purchase**, if you make one, is processed by Google Play as
necessary to **perform the contract** for that purchase.
The data controller is BT Developer. For the advertising and payment processing described
above, Google acts as an independent controller of that data under its
own privacy policy.
## Your rights
Under the GDPR you have the right to access your personal data, to have
it corrected or erased, to restrict or object to its processing, and to
data portability.
We hold no personal data ourselves — everything this App stores stays on
your device — so in practice there is nothing for us to retrieve, correct
or erase on your behalf; uninstalling the App removes it all. Requests
concerning advertising or purchase data should be directed to Google,
which holds that data as its own controller.
You also have the right to lodge a complaint with a supervisory
authority. In Finland that is the Office of the Data Protection
Ombudsman (Tietosuojavaltuutetun toimisto), tietosuoja.fi.
## Changes to this policy
We may update this policy from time to time. The "last updated" date at
the top will change when we do, and the current version will always be
available at
https://doc-hosting.flycricket.io/sudoku/e1f77064-12f0-48a1-9676-3bd58e1334dd/privacy.
## Contact
Email: baladream.help@gmail.com
Publisher: BT Developer