Privacy Policy

Epidemic Roll Call (Android app and web version) | Last updated: October 30, 2026

Epidemic Roll Call is a single-player logic deduction game, made and maintained by an individual developer, gtj3jo ("we"). This document explains what data the game handles, what it is used for, and the choices you have.

1. Data we do not ask for

The game needs no registration or login (the leaderboard in the Android app is optional, see section 5), and it never asks for your name, email address, phone number, location, contacts, photos or microphone. We have no server of our own and we do not collect your game data (see section 6 for the Android app's anonymous usage statistics).

2. Data stored on your device

The following data is stored only on your own device (in the browser's or the app's local storage) and is never uploaded (the only exception is the optional weekly challenge leaderboard, see section 5):

Game progress: levels cleared, daily puzzle records, titles, and the rules and stories you have seen.
Settings: difficulty, language, light/dark theme, and the music and sound effect switches and volume.

You can use "Back up / restore progress" in the menu to get a backup code and keep it yourself or move it to another device. You copy and keep the backup code yourself; we never receive it. Clearing the app's data, clearing the browser's site data, or uninstalling the app deletes this data, and we cannot recover it.

3. Ads (Android app)

The Android app uses Google AdMob to show two kinds of ads: "rewarded ads" (when you have used up a level's free hints, you can choose to watch an ad to get one more hint; it only plays when you tap "Watch an ad for a hint") and "interstitial ads" (played now and then when you move on to the next level after clearing one, with a minimum gap; they never pop up while you are solving). After you buy "Remove ads", neither kind is shown any more. The web version has no ads.

When an ad plays, Google and its advertising partners may collect and use device and ad-related data, such as the Advertising ID, IP address, device model and operating system version, app version, approximate region, and your interactions with the ad (views, clicks), to serve ads, measure performance and prevent abuse. This data is handled by Google under its own policies, and we cannot see your personal advertising data. For details, see:

You can reset or delete your advertising ID, or opt out of personalized ads, in Android under "Settings → Google → Ads". In regions where consent is required (for example the European Economic Area), the game shows a consent choice before it plays an ad. You can accept or decline, and change your choice at any time.

4. In-app purchase (Android app)

The Android app offers a one-time "Remove ads" purchase, and the payment is handled entirely by Google Play. We never receive or store your payment method, card or billing details. Google Play keeps the purchase record; the game only asks Google Play whether this Google account has bought "Remove ads", to decide whether to show ads. After changing phones or reinstalling, tap "Restore purchase" in the menu. Refunds and order questions follow Google Play's rules.

5. Weekly challenge and leaderboards (Android app)

The Android app's "Time Rush" mode has a "Weekly challenge": one fixed set of boards per chapter per week, and your score can be sent to a Google Play Games Services leaderboard. This is an optional feature; the rest of the game works without it, and the web version has no leaderboards.

Google Play Games Services is only started when you finish a weekly challenge run or open the leaderboard yourself, and Google's own screen asks you to sign in with your Google Play Games account. Opening the game normally never connects to it.
The only data we send is the leaderboard score for that chapter (one number calculated from levels cleared and leftover supplies).
Google handles your Google Play Games player ID, gamer name and avatar to show your rank. Other players may see your name, avatar and score (depending on the profile visibility you set in Google Play Games). This data is handled by Google under its own policies; we have no server of our own and we do not receive or store your player data.
You can manage or delete your Google Play Games account and data in the Google Play Games app's settings, or write to us (see section 12) and we will help.

6. Anonymous usage statistics (Android app)

The Android app uses Google's Firebase Analytics to collect anonymous usage statistics, to learn where players get stuck and which features are used, so we can improve the game (for example the tutorial and level difficulty). Traffic statistics for the web version are described in section 7.

What: events and simple numbers, such as "finished the tutorial", "a level started, was cleared or failed" with the time taken, mistakes and hints used, whether a rewarded ad was watched for a hint, and levels cleared in Time Rush; plus general device and app information (app version, Android version, device model, language, approximate region). Google tells devices apart with a random app-instance ID it generates, which is not your name, account or email address; on Android the device's advertising ID may also be used (depending on your device settings).
Never sent: your saved progress, backup codes, or any text you type. It is not linked to your Google account.
Your choice: Settings has an "Anonymous usage statistics" switch. It is on by default and you can turn it off at any time; nothing is sent after that. In regions where consent is required first (for example the European Economic Area), nothing is sent until you have given consent (see the ad consent in section 3).
This data is handled by Google under its own policies (Firebase privacy and security) and is kept in Google Analytics for 14 months. We have no server of our own and only see the summary reports Google Analytics provides.

7. Access logs of the web version

The web version is hosted on Cloudflare Pages. As the hosting provider, Cloudflare may record general network access data (for example IP address, browser type and access time) under its own policies, to keep the service running and secure. The web version also uses Cloudflare Web Analytics to count visits and where they come from (for example which social link brought you here, via the ?src= parameter in the link). It uses no cookies, does no cross-site tracking and does not identify individuals; it only produces aggregate page views, referrers and general browser / country information. It is not loaded when your browser has "Do Not Track" turned on, and it is never linked to your game progress. See section 6 for the Android app's anonymous usage statistics.

The web version also has its own anonymous event statistics, used to learn how many people finish the tutorial, clear level 1 or come back the next day, and how many people each promotion link (/s/channel) brings. When you open the page, start or finish a level, go through tutorial steps or tap a download link, the page sends the event name, level number, result and time taken, together with a randomly generated anonymous ID (kept in your browser's localStorage, not a cookie; clearing site data gives you a new one), to our database on Cloudflare. It does not send your name, IP address, backup code, saved progress or anything you type. Nothing is sent when your browser has "Do Not Track" turned on, and you can also turn it off with "Anonymous usage statistics" in the menu's Settings.

8. Feedback

"Report a problem / feedback" in the menu opens an external Google Form, and whether to fill it in is up to you. What you write in the form (including any contact details you choose to give) is stored under Google Forms' rules, and we only use it to improve the game and to reply to you.

9. Children

The game's theme includes an apocalypse and infection, and it is not designed for children under 13. We do not knowingly collect personal data from children. If you are a parent or guardian and you find that your child has provided data without your consent, please contact us.

10. Sharing and security

We do not sell your data and we do not give it to third parties, except for the ads (Google AdMob), the purchase service and leaderboards (Google Play, Google Play Games Services), the hosting (Cloudflare) and the feedback form (Google) described above. Local data stays on your device, so please look after your device and your backup code.

11. Changes to this policy

If the features or the way data is handled change, we will update this document and the date above. Continuing to use the game means you accept the updated content.

12. Contact us

If you have a question about privacy or about your data, please write to: gtj3jocrypto@gmail.com