Last updated: 19 September 2026
Mavna Studio ("we") operates the mobile application Cast — Shadow Brain Puzzle (package com.mavnastudio.castshadow, the "App"). This policy explains how the App handles data.
The App requires no account, login or sign-up. We do not ask you for your name, e-mail address, phone number, photos or contacts. Your game progress stays on your device.
Data leaves your device for two purposes, and only to Google: advertising (Google AdMob) and usage analytics that help us understand how the game is played (Google Analytics for Firebase). Neither includes your name, your e-mail address or your precise location. We do not sell your data.
You can also reach this policy from within the App: the "Privacy policy" link on the in-game collection screen (the screen that lists the shadows you have found).
Game progress — solved figures, settings and counters — is stored locally using Android's standard storage. We cannot access it. Uninstalling the App deletes it.
The App displays advertisements through Google AdMob (Google LLC). To serve and measure those advertisements, the Google Mobile Ads SDK collects the following and shares it with Google:
This data is processed for three purposes:
Google's handling of this data is governed by Google's own policies: policies.google.com/privacy and policies.google.com/technologies/partner-sites
To improve the game — to see where players get stuck, whether the first minutes are clear, and how long a puzzle takes — we use Google Analytics for Firebase (Google LLC). On our behalf, it collects:
Not collected: the Advertising ID is not collected for usage analytics. Names, e-mail addresses, phone numbers and any text you type are not collected.
How it is used: only to improve the game. This data is not used for advertising; ads personalisation and Google signals are turned off, and usage analytics is not linked to our advertising account.
How long it is kept: 14 months, after which it is deleted automatically.
Google's handling of this data is governed by Google's own policies: policies.google.com/privacy and firebase.google.com/support/privacy
We do not sell your data and we do not share it with any party other than Google.
Advertising ID. You can reset or delete your Advertising ID at any time from your device settings (Settings → Privacy → Ads).
Analytics identifier. Uninstalling and reinstalling the App renews the app instance ID; earlier usage data is not linked to the new installation.
Consent — EEA, United Kingdom and Switzerland. If you are located in the European Economic Area, the United Kingdom or Switzerland, the App asks for your consent before serving personalised advertisements, using Google's User Messaging Platform. In these regions, usage analytics also runs only with this consent. You may withdraw or change your choice at any time from within the App, via the "Ad preferences" entry on the in-game collection screen. Outside these regions this entry is not shown.
United States. Residents of US states with applicable privacy laws may contact mavnastudio@gmail.com to exercise opt-out rights.
The App contains no in-app purchases and does not process payment information.
The App is not directed to children under 13 and is rated for ages 13 and over. We do not knowingly collect data from children under 13. If you believe a child has provided data, contact mavnastudio@gmail.com and we will act.
We do not collect personal details such as your name or e-mail address. Usage analytics data is kept on Google's servers on our behalf for 14 months and then deleted automatically; it is not linked to your identity. Uninstalling the App removes locally stored progress. Data collected through advertising is retained in accordance with Google's policies.
Data in transit is protected with industry-standard encryption (TLS). No method of transmission is completely secure.
We will post any changes on this page with a revised date. For material changes, an "updated" mark is shown once next to the "Privacy policy" link inside the App.