Privacy Policy
Nums to One
Nums to One
Effective date: 2026-10-03
| Controller | Willee Project |
|---|---|
| App | Nums to One (net.willee.numstoone) |
| Contact | hanworld@willee.net |
| What | Details |
|---|---|
| Game records | IDs and solve times of the puzzles you solved, success rate by tier, skill rating per target, Rush best score and games played, Daily results and streak, whether you finished the first-run guide |
| Settings | Sound effects, vibration, reduce effects, language |
This data is never sent to us. It is deleted when you uninstall the app.
Device backup. If you have turned on your device's Google backup (Android Auto Backup), the records and settings above are included in that backup, so they come back when you switch devices or reinstall the app. The backup is stored in your Google account; we cannot see it. You can turn it off in the backup menu of your Android settings.
Separately, the ad SDK and Firebase store consent records (such as your choice in the EEA) and the identifiers listed below on your device.
We receive only what we need to improve the app. There is no personal information such as your name or email. We see the data below as statistics in the Firebase console.
| What | Examples | Why |
|---|---|---|
| App instance ID | A random ID created when the app is installed | Counting whether the same device comes back the next day (retention) |
| Game events | Puzzle ID, result and solve time, hints and undos used, Rush score, Daily results, finishing the first-run guide, tapping Share | Tuning puzzle difficulty to real play, improving the modes |
| App usage | App launches, time spent, app updates | Understanding retention and play time |
| Device and app info | Device model, Android version, app version, language, country (estimated from the IP address; the IP address itself is not stored) | Finding device-specific problems, understanding use by language |
| What | Why |
|---|---|
| Where in the code the error happened (stack trace), time of the error | Fixing the error |
| Device model, Android version, app version, memory and storage status | Finding which devices are affected |
| Crashlytics installation ID (a random ID) | Counting how many devices hit the same error |
Crash reports are deleted after 90 days.
Google processes this data on our behalf. For details, see Privacy and Security in Firebase.
A single banner appears at the bottom of the screen (we remove the ad while you play Rush and during the first-run guide). Ads are served by Google AdMob, and Google and its advertising partners process the following.
| What | Why |
|---|---|
| Advertising ID (Android advertising ID), app set ID, and where applicable identifiers related to the account signed in on the device | Serving ads, frequency capping, measuring performance, analytics, preventing fraud and abuse, and personalization if you consent |
| IP address | Delivering ads, approximate location estimated from the IP address (country or city level) |
| Device and app info (model, OS version, language, screen size, app version) | Choosing ads that fit the screen, preventing fraud and abuse |
| Interactions with ads (impressions, clicks) | Measuring performance, preventing invalid clicks |
| App usage (interactions such as app launches and taps) | Ad delivery and measurement, analytics, preventing fraud and abuse |
| Diagnostics (performance information such as launch time and hang rate) | Ad delivery, analyzing app and ad SDK performance, preventing fraud and abuse |
We do not receive this data. We only receive aggregate reports such as ad revenue. Google also processes this data as an independent controller. For details, see Google's documents:
If you are in the EEA, the UK or Switzerland, a consent window appears the first time you open the app. We ask through a Google-certified consent management tool (UMP), and your choices apply to both ads and usage statistics.
| Where | How |
|---|---|
| In the app | Top right of the home screen: Settings (gear) → Privacy options — reopen the consent window and change your choices at any time (shown only in regions where consent is required) |
| On your device | Android settings → Privacy → Ads → reset or delete your advertising ID |
| To stop entirely | Uninstalling the app deletes the records and the app instance ID on your device |
When you tap Share on a result screen, the result text (for example Nums to One #42 🔥7) is passed to your device's share sheet. You choose where it goes; the app itself does not send it anywhere.
| What | Legal basis |
|---|---|
| Personalized ads | Consent (Art. 6(1)(a)), obtained in the consent window above |
| Non-personalized ads, fraud and abuse prevention, ad delivery | Consent or legitimate interests (Art. 6(1)(f)), depending on local law |
| Usage statistics, crash reports | Legitimate interests (Art. 6(1)(f)): fixing errors in the app and tuning puzzle difficulty. In the EEA, storage for statistics is limited according to your choice in the consent window. |
| Game records on the device | Not processed by us, since they are never sent to us |
Usage statistics, crash reports and ad data are processed on Google's servers, including outside Korea and the EEA (for example in the United States). Google states that it uses legally recognized transfer mechanisms such as the EU Standard Contractual Clauses (SCCs).
If you are in the EEA or the UK, you have the following rights under the GDPR (Articles 15–22):
Where to send a request. We do not know your name or contact details, so we cannot find a specific person's records in the usage statistics. When you uninstall the app, its app instance ID is removed, so later data cannot be linked to earlier data, and the remaining data is deleted after the retention periods above. Requests about ad data must go to Google, which actually holds it (see the Google Privacy Policy). If you are not sure what to ask or where, write to hanworld@willee.net and we will help as best we can.
Complaints. EEA residents may complain to the data protection authority in their country, and UK residents to the Information Commissioner's Office (ICO). In Korea, you can report to the Personal Information Infringement Report Center (privacy.kisa.or.kr, dial 118).
This app is not directed at children. It is listed on Google Play for users aged 13 and over. We do not knowingly collect personal information from children.
If you are the parent or guardian of a child under 16 (13 to 16 depending on the member state) and are concerned about their use of this app, please contact hanworld@willee.net.
If we change this policy, we will post it on this page with a new effective date. For significant changes, we will also let you know through an app update notice.