Privacy policy
Last updated: 11 November 2026
This policy explains what data the game Cồng Kềnh (“the game”) uses and why. The game is made by an independent developer (“we”). You can reach us at contact@nguyenngo.dev.
In short
- The game has no accounts. It sends anonymous game statistics and crash reports through Google Firebase, so we can fix bugs and balance the levels; they don’t include your name or contact details.
- Your progress and settings are stored only on your device.
- The game shows ads from Google AdMob. Google collects some device data to show and measure those ads, and asks for your consent where the law requires it.
Data stored on your device
The game saves your progress (levels, stars, coins, vehicles and gear), your sound settings and your language on your device. This data never leaves your device and is not sent to us. Uninstalling the game deletes it.
Game statistics and crash reports (Google Firebase)
The game uses Google Firebase Analytics and Firebase Crashlytics to learn which levels are too hard or too easy and to find and fix crashes. They collect:
- game events, such as a level started, won or lost, a revive, a delivery, or an ad watched for a reward;
- crash reports: what went wrong in the app, and the last game events before it;
- a random identifier for this installation of the game, which is reset when you reinstall it;
- device and app information, such as the model, operating system, language, country and app version.
Firebase does not collect your advertising identifier for this, and the statistics are not used to personalise ads. We see the data only as totals and individual crash reports, never linked to your name. Google processes it for us under the Firebase privacy and security terms and deletes it after a limited time.
Advertising (Google AdMob)
The game shows ads through Google AdMob: rewarded ads that you choose to watch (for example to carry on after a crash, or to double your coins), and occasionally a full-screen ad between deliveries. To show, measure and protect these ads against fraud, Google may collect:
- your device’s advertising identifier (the Android advertising ID, or the iOS IDFA if you allow tracking);
- your IP address and the approximate location derived from it;
- device and app information, such as the model, operating system, language and app version;
- how you interact with ads.
Google processes this data under its own policies; we only receive anonymous totals, such as how many ads were shown. Learn more: How Google uses information from apps that use its services.
Your choices
- Consent (EEA, UK, Switzerland). On first launch the game shows Google’s consent form. You can change your choice at any time in the game under Settings → Privacy.
- US states. Where state law gives you the right to opt out of the sale or sharing of personal information, you can do so in the same place.
- iPhone and iPad. The game asks before using your IDFA for tracking. You can change this in iOS Settings → Privacy & Security → Tracking.
- Android. You can reset or delete your advertising ID in your device’s settings (Google → Ads, or Privacy → Ads).
If you decline personalisation, you will still see ads, but they will not be based on your interests.
Children
The game is not directed at children under 13, and we do not knowingly collect personal information from them. Ads in the game are limited to content suitable for a general audience. If you believe a child has provided personal information through the game, contact us and we will help.
Your rights
Depending on where you live (for example under the GDPR in Europe or privacy laws in some US states), you may have the right to access, correct or delete personal data, or to object to its use. We hold no data that identifies you: the game statistics and crash reports are tied only to the random installation identifier, and reinstalling the game starts a new one. For advertising data, use the choices above or Google’s tools. You can always contact us and we will help.
Changes to this policy
If the game starts using new services, for example in-app purchases, we will update this policy and the date at the top of this page.