Privacy Policy

For Chain Decouple: Logic Puzzle on Android. Effective 5 November 2026.

This policy explains what information Chain Decouple (“the game”) handles, why, and what choices you have. The game is made by JN GOOD TECH LTD, trading as SmartGek Studio (“we”, “us”). We built the game to collect as little as possible: there are no accounts and no analytics, and we run no servers for it. The game shows occasional full-screen ads between levels and offers optional reward videos, served by Google AdMob.

Information the game handles

Game progress and settings

The game saves your current level, coins, chosen chain material, the date you last finished the Daily Challenge and your daily streak, whether you own “Remove Ads”, and your language, music and sound settings. All of this is stored on your device and is not sent to us or to any server we operate. Levels and Daily Challenges are created on your device, so playing them sends nothing to us. The game reads your device’s language to choose its first language, and its date to choose the Daily Challenge; the game does not send either to us.

Android backup

If backup is turned on for your device, Android may include the game’s saved data in your personal Google backup, so that it can be restored on a new device. This backup is run by Google and is tied to your Google account. We cannot access it. You control it in your device’s backup settings.

In-app purchase

The one-time “Remove Ads” purchase is handled entirely by Google Play Billing. When you buy it, Google processes the payment and gives the game a purchase record containing details such as the product ID, order ID, purchase token and purchase status. The game checks this with Google Play to deliver and restore your purchase, including when you open the game. We never receive your name, card number, billing address or other payment details. See the Google Privacy Policy and the Google Payments Privacy Notice.

Advertising (Google AdMob)

The game shows a full-screen ad now and then between levels, never during play. You can also choose to watch a reward video to earn coins. Buying “Remove Ads” stops the ads between levels; reward videos stay available, but only play if you choose to watch one.

To choose and measure ads, the Google Mobile Ads SDK built into the game collects information such as your device’s advertising ID, IP address, approximate location derived from it, device and app information, and how you interact with ads. This information goes to Google, not to us, and Google uses it as described in How Google uses information from sites or apps that use its services. The reports we receive from AdMob are about ad performance and do not identify you.

Your choices. In regions where consent is required, such as the European Economic Area, the UK and Switzerland, the game uses Google’s consent tool to ask for your choice before ads are requested. Where this applies, you can change your choice at any time in Settings → About → Privacy Settings. On Android you can also reset or delete your advertising ID in your device’s settings (usually Privacy → Ads, or Google → Ads).

Information collected by Google Play

Because the game is distributed through Google Play, Google may collect technical information such as device model, Android version, crash reports and install statistics, and may share aggregated or anonymised reports with us through the Google Play Console. We use these reports only to fix bugs and improve the game.

Device permissions

The game does not ask for access to your contacts, photos, camera, microphone, files or precise location. The permissions it declares support internet access, ads, the advertising ID, Google Play purchases and device vibration. Some are added by Google’s software and are needed for its ads and billing services to work.

How we use information

Where data protection law such as the UK GDPR or EU GDPR applies, our legal basis for processing purchase records is performance of a contract (giving you what you bought); for crash reports it is our legitimate interest in keeping the game working; and for personalised advertising, and any storage or access on your device that needs consent, it is your consent, which you can withdraw in Privacy Settings.

Sharing

We do not sell, rent or trade personal information for money. The only third party involved in running the game is Google, as the operator of Google Play, Google Play Billing and Google AdMob. We may disclose information if required by law.

Keeping and deleting your data

Game progress stays on your device until you clear the app’s data or uninstall the game. A copy may remain in your Google backup until Google removes it or you delete it. Purchase history is kept by Google as part of your Google account; you can view it under Payments & subscriptions in the Google Play Store app. Google keeps advertising data under its own retention rules. Because we hold no personal data on our own servers, there is usually nothing further for us to delete, but you can contact us with any request and we will respond.

Children

The game is not directed at children under 13, and we do not knowingly collect personal information from them. If you believe a child has provided us with personal information, contact us and we will help.

Your rights

Depending on where you live, you may have the right to access, correct, delete or restrict the use of your personal information, to object to processing, and to complain to your local data protection authority (in the UK, the Information Commissioner’s Office).

Residents of California and some other US states have the right to know what is collected, to ask for deletion, and to opt out of the “sale” or “sharing” of personal information. We do not sell personal information for money, but those laws can treat personalised advertising through services such as AdMob as a sale or sharing. You can opt out using your device’s ad settings and, where shown, the game’s Privacy Settings.

To exercise any of these rights, email us at the address below. Requests about data held by Google are best made to Google directly, because we do not hold that data.

Security and international transfers

Payments and ads are handled over Google’s systems, and the game does not transmit your progress to us. Google may process information in countries other than your own, under the safeguards described in its privacy policy. No method of storage is completely secure, but we keep the information we handle to the minimum needed.

Changes to this policy

If the game changes how it handles information, for example by adding online features, we will update this page and the effective date above before the change takes effect.

Contact

Questions or requests about this policy: smartgek@outlook.com
SmartGek Studio (JN GOOD TECH LTD), smartgek.com