Privacy Policy of the game Asterism
Last updated: 6 November 2026
In short
Asterism sends me no personal data. It goes online only to talk to Google: to Google Play, to buy or restore “the full sky” and, at a few high points, to show its rating dialog; and to Google Play Games, if you use it, for achievements and to keep your progress in your Google account.
In detail
No data collection. I collect, process and receive no personal data, and share none with third parties. The game has no account or registration of its own; it can use your Google Play Games profile (below).
Internet access. The app holds the permissions android.permission.INTERNET, ACCESS_NETWORK_STATE and Google Play’s BILLING, which Google Play Billing needs. They are used to ask Google Play for the price of the full sky, to buy it and to check whether you own it, and for Google Play Games (below). There is no server of mine: no backend and no accounts of mine. All puzzles ship inside the app, and the game plays offline.
No tracking, no ads, no analytics of mine. No advertising library is included, and no analytics or crash reporting that reports to me. The Google Play Games software in the app sends Google its own usage and diagnostic data (below).
Progress and settings. Solved puzzles, your ratings, the nights of "Tonight's sky" you solved (by date), a puzzle you left half-way, the last puzzle you opened, which rule cards you have already seen, how many times you have swiped a hex (until the swipe reminder retires), the Deep Sky skies you charted with your chosen law and depth and the order they are dealt in, how many hints you asked for on a puzzle in progress, whether you own the full sky, and your settings are stored in the app's private storage on your device. If you have turned on your device's backup to your Google account, Android may include them in that backup, so they can be restored on a new phone or after reinstalling the app. This backup is made by Android and Google; I never receive it. You can turn it off in your phone's backup settings. Uninstalling the app deletes the data on the device.
Permissions. Apart from the three that Google Play Billing needs (above), and one internal permission that Android’s support library adds so the app’s own parts can signal each other, the app requests no permissions: none for location, contacts, camera, microphone, storage, phone or vibration.
Google Play. The app is distributed through Google Play. Google may process data when you download or update it, under Google's privacy policy. Google Play may also show me aggregated, anonymous statistics about installs, crashes and app performance; these do not identify you.
Google Play Games. If you have a Google Play Games profile, the game signs in to it when it starts; if you have none, Google may offer to create one, which you can decline. You can also sign in later from Settings. While you are signed in, the achievements you earn are recorded under your profile, and Google shows them in Google Play Games as your profile’s visibility settings allow; and your progress (solved puzzles with their seals, the nights you solved, the rule cards and tips you have seen, and the worlds open to you) is kept as a saved game in your Google account, so a phone signed in to the same profile gets it too. Your settings, a puzzle in progress and the purchase are not part of it. Google stores and handles this under its own privacy policy; I never receive it. The Google Play Games software in the app also sends Google usage and diagnostic data that Google uses to keep it working well; I never receive that either. You can sign out of Google Play Games in its settings, and delete its data as described below.
Purchases. “The full sky” is a one-time purchase through Google Play. Google handles the payment under its own privacy policy; I never see your payment details. Google Play reports each order to me with the order information it gives developers (such as an order number, the product, the price, the date and the country). The app remembers on your device that you own the full sky, so it opens offline.
Sharing a solve. When you tap Share on a solved puzzle, the app draws a card with the puzzle’s name, your seals and stars, your time and your hint count, saves it in the app’s private storage and opens Android’s share menu. The card and its line of text go only to the app or person you choose there; nothing is sent to me, and nothing is shared unless you choose to.
Rating the app. At a few high points (finishing a world’s finale or mastering a world, at most three times and months apart) the game may ask Google Play to show its rating dialog. Google shows and handles it under its own privacy policy; the app learns nothing about whether it appeared or whether you rated. A rating you leave is public on Google Play, as any review there.
Deleting your data
Asterism (by Tobias Kummer) keeps no data with me, so there is nothing of yours on my side to delete. What the game stores is in two places, and you can delete both yourself:
- On your phone: your progress, settings and whether you own the full sky. Uninstall Asterism, or clear its storage in Android’s settings (Apps, Asterism, Storage, Clear storage).
- With Google Play Games, only if you signed in: your achievements, the saved game and your other Play Games data for Asterism. Open your Play Games profile (or the Play Games settings on your phone) and delete your Play Games data: either the data of Asterism alone, or your whole Play Games profile. Google then deletes it under its own policy.
Kept: the order information of a purchase of the full sky, which Google Play gives me and which tax law requires me to keep. Deleting your data does not undo or refund a purchase.
Your rights
Under the GDPR you have the right of access, rectification, erasure, restriction of processing, data portability and objection (Articles 15 to 21 GDPR) and the right to lodge a complaint with a supervisory authority. The app stores no personal data with me; for a purchase, Google Play’s order information is all I have, and I can look up an order by its number if you write to me.
Changes
This policy will be updated before a version is released that changes anything described here.
Controller
Tobias Kummer
Kantstraße 42
73312 Geislingen
Germany
Email: tobiaskummer@googlemail.com
This is also the imprint under § 5 DDG and names the controller within the meaning of Article 4(7) GDPR.