CHECKSUM — PRIVACY POLICY

Last updated: 13 August 2026.Cathode Ray Games (“we”, “us”) respects your privacy. This policy covers the CHECKSUM Android application and the CHECKSUM web version at checksum.cathoderaygames.com.

CHECKSUM does not collect, transmit, sell or share any personal data. There is no account system, no analytics, no advertising, no crash reporting and no third-party SDK of any kind in the application.

There is a particular irony in a game about being interrogated by a verification system, so we will be precise rather than reassuring: below is exactly what the build does, including the one place where your data can leave the device, and how to check each claim yourself.

1. The game makes no network requests

Everything CHECKSUM needs is inside the app package. The ten verification tests, PROCTOR’s dialogue, the visual corruption and all audio are generated on your device at runtime — the game ships with no audio or image files to download, because the sound is synthesised and the graphics are drawn in code.

The application issues no HTTP requests. It contacts no server of ours, and no server belonging to anyone else. It works with the device in aeroplane mode, permanently and by design.

In the interest of not overstating this: the Android package does declare the INTERNET permission. It is added automatically by Capacitor, the framework that wraps the game for Android, and CHECKSUM does not use it. We would rather tell you the permission is present and unused than have you find it in the manifest and wonder what else we left out.

The only other permission is VIBRATE, which is what the haptics run on. The app does not request location, contacts, camera, microphone, or access to your files. It contains no advertising and no links out to third-party services.

2. What the game stores, and where

CHECKSUM remembers one thing: your best run — the score and the level you reached. It is written to your device’s local storage under a single key, checksum.best.v1.

That is the entire save file. The game does not record your individual answers, your reaction times, how you failed, which tests you struggle with, or anything else PROCTOR claims to be logging. PROCTOR’s notes are fiction. Nothing is being kept on you.

We have no copy of your best score and no way to obtain one. Uninstalling the app deletes it. Clearing the app’s storage deletes it. Because we hold no data about you, there is nothing for you to request, correct or export from us.

3. Android’s own backup

CHECKSUM allows Android’s standard backup service to include its save file in a device backup, so your best score survives moving to a new phone.

If you have that feature switched on, a copy of that one value may be stored in your own Google account. This is a platform feature operated by Google under Google’s terms, performed by the operating system rather than by the app. It can be turned off in your device settings, it is separate from anything we control, and we cannot read it.

Apart from a report you choose to share yourself (section 4), this is the only route by which anything CHECKSUM stores can leave your device — and what travels is a copy of your high score.

4. Sharing your report

The end of a run offers to share a verification report — an image showing your score, how far you got and what PROCTOR classified you as. Nothing is shared unless you tap that button.

The image is drawn on your device and handed to your phone’s own share sheet. You choose where it goes; we are not a party to it and receive no copy and no notification. Whatever you send it to is governed by that app’s privacy policy, not this one.

The report contains your score and classification. It contains no account, no identifier and nothing about you that you did not put there by playing.

5. The web version

The web version is served as static files and runs the same code as the app. It stores the same single best-score value in your own browser’s localStorage — on your device, readable only by the site, never sent anywhere. Clearing your browser’s site data removes it.

The game sets no cookies and runs no analytics, tag manager or tracking pixel. Web hosting providers commonly keep short-lived server request logs (IP address, user agent, time of request) as a standard operational and security measure. We do not read, analyse or retain such logs, and they are governed by the host’s own policy.

6. Children

Because CHECKSUM collects nothing from anyone, it collects nothing from children, knowingly or otherwise. There is no chat, no user-generated content shared between players, no social feature, no advertising and no external links.

On suitability rather than privacy: CHECKSUM contains no violence and no explicit content, but PROCTOR’s dialogue is written to be quietly unsettling, and the game is rated accordingly on each store.

7. Payments

Any purchase you make is handled entirely by Google Play under Google’s terms. We never see your payment details. We receive only the aggregate, anonymised sales reporting Google provides to every developer, which contains no information identifying you.

8. Changes to this policy

If this policy ever changes, the revised version will be published on this page with an updated date, and the change will be described in the app’s release notes on Google Play. We will not quietly widen what we collect and leave you to notice.

9. Contact

Questions about this policy: cathoderaygames@gmail.com
cathoderaygames.com