Dadoku
Privacy Policy
์ํ (the "Company") complies with the Personal Information Protection Act of the Republic of Korea and other applicable laws, and publishes this policy to protect your personal information. It applies to the Sudoku app "Dadoku" (the "Service") and the website dadoku.app.
Article 1. What we collect and how
The Service has no sign-up or sign-in. We do not collect your name, phone number, location, contacts, or photos. These three things are all we collect:
- Advertising identifier (Android advertising ID, iOS IDFA), ad impressions and clicks, approximate location inferred from your IP address, and device and app diagnostics (device model, OS version, ads SDK errors)
- Results of finished games โ for today's puzzle: date, difficulty, and whether it was solved; for other games: board size, difficulty, and whether it was solved (no identifier)
- App usage records (screen views, launch counts, and similar anonymous statistics) and crash reports (device model, OS version, and where the error occurred), plus an anonymous identifier generated per installation
- Email address and message (only if you write to us)
- How: automatically by the ads SDK; sent by the app when you finish a game (you can turn this off); and email you send us.
- Your games, records, statistics, and settings are stored only on your device and are never sent to us.
Article 2. Why we use it
- To show ads in the app, limit repeats, and prevent invalid clicks
- To total and show how many players solved today's puzzle and each difficulty
- To answer your messages
Article 3. How long we keep it
- We delete information without delay once its purpose is fulfilled.
- Puzzle results are stored only as totals per date, board size, and difficulty; no per-person record is made. The server that receives them does not store IP addresses.
- Support email is deleted once your inquiry is resolved, unless the law requires us to keep it longer.
- Electronic files are deleted permanently so they cannot be recovered.
Article 4. Sharing with third parties
We do not share your personal information with third parties, except with your prior consent or where the law requires it.
Your advertising identifier is processed by Google in the course of showing ads (Article 5). Personalised ads are shown only with your consent; otherwise you see non-personalised ads.
Google may also use this information under its own privacy policy to provide and improve its advertising services (policies.google.com/technologies/partner-sites).
Article 5. Processors
We entrust the following tasks to these processors:
| Processor | Task |
|---|---|
| Google (AdMob) | Showing ads in the app |
| Google (Firebase Analytics ยท Crashlytics) | Aggregating app usage statistics and collecting crash reports |
| Cloudflare | Hosting the website and the server that totals puzzle results; receiving support email |
If a processor or task changes, we will update this policy.
Article 6. International transfers
To provide the Service, we entrust the processing of personal information to the following processors outside the Republic of Korea:
| Google LLC | Google LLC (Firebase) | Cloudflare, Inc. | |
|---|---|---|---|
| What is transferred | Advertising identifier, ad impressions and clicks, IP address, device and app diagnostics | App usage records (screen views, launch counts), crash reports (device model, OS version, where the error occurred), and an anonymous per-installation identifier | Puzzle results (no identifier), IP address (processed in transit), and the address and content of support email |
| Destination country | The United States and other countries where Google operates data centres | The United States and other countries where Google operates data centres | The United States and other countries where Cloudflare operates servers |
| When and how | Sent over the network each time the app requests an ad | Sent over the network when the app starts or an error occurs | Sent over the network when you finish a game, visit the website, or email us |
| Recipient contact | googlekrsupport@google.com | googlekrsupport@google.com | privacyquestions@cloudflare.com |
| Recipient's purpose | To show ads in the app, limit repeats, and prevent invalid clicks | To find and fix errors, and to understand which features are used so we can improve them | Hosting the website and the server that totals puzzle results; receiving support email |
| Retention period | For the period set out in Google's privacy policy | For the period set out in Google's privacy policy | Puzzle results are kept only as totals; support email until your inquiry is resolved; access records for the period set out in Cloudflare's privacy policy |
| How to refuse, and the effect | You can delete your advertising identifier or turn off personalised ads in your device settings. To refuse the transfer altogether, use the app without an internet connection: puzzles still work, but ads, and the hints and lives earned by watching them, are not available. | Nothing is sent if you use the app without an internet connection; puzzles still work. Deleting the app stops any further transfer. | Turn off Settings โบ Data โบ "Send anonymous stats" in the app and no puzzle results are sent; nothing else in the Service changes. Support email is transferred only if you write to us. |
Article 7. Your rights and choices
- Stop sending puzzle results: Settings โบ Data โบ "Send anonymous stats" in the app. When off, nothing is sent and nothing is saved to send later.
- Change your consent to personalised ads: where a consent form is shown, use Settings โบ Data โบ "Ad settings" in the app. On iOS you can also use Settings โบ Privacy & Security โบ Tracking on your device.
- Reset or delete your advertising identifier in your device settings.
- Delete the records on your device by deleting the app.
- Ask to see or delete an email you sent us: write to support@dadoku.app and we will act without delay.
Article 8. Children
We do not collect age information and do not knowingly collect personal information from children under 14. A parent or guardian can ask us through support to see or delete an email their child sent us.
Article 9. Security
- Access to information is kept to the minimum needed.
- Data in transit is encrypted (TLS), and the servers are designed not to hold information that identifies you.
- Physical access to data centres is controlled by our cloud providers.
Article 10. Automatic collection
- The app uses the advertising identifier to show ads (Article 1).
- Personalised ads use behavioural information such as your advertising identifier and ad impressions and clicks. The ads SDK (Google AdMob) collects it automatically while you use the app; we do not keep a copy.
- You can refuse personalised ads as described in Article 7, items 2 and 3. Refusing does not limit your use of the Service.
- The website dadoku.app does not use analytics or advertising cookies.
Article 11. Privacy officer
The following person is responsible for handling personal information and resolving complaints:
- Privacy officer โ Name: ์์ข ์ฑ ยท Contact: support@dadoku.app
Article 12. Remedies (Republic of Korea)
You can contact these agencies for advice or remedies regarding personal information:
- Personal Information Dispute Mediation Committee (1833-6972, www.kopico.go.kr)
- Personal Information Infringement Report Center (118, privacy.kisa.or.kr)
- Supreme Prosecutors' Office Cyber Investigation (1301, www.spo.go.kr)
- Korean National Police Agency Cyber Bureau (182, ecrm.police.go.kr)
Article 13. Changes to this policy
We may revise this policy when the law or the Service changes, and will post the revision here. For significant changes we will give notice before they take effect.
- Announced: 2026-10-02
- Effective date: 2026-10-02