Cozy Check · Black 4 Square
Privacy Policy
Effective 8 October 2026
This privacy policy is for the Cozy Check game on Google Play, package com.black4square.CozyCheck, and its web version. The developer is Black 4 Square, the name under which Daniil Denysov publishes games.
In short
- You can play as a guest, without an account: your building is then saved on your device only.
- Signing in with Google is optional. If you do, we receive your Google email address, name and profile picture address, and keep a copy of your progress in the cloud so you can get it back on any device.
- Nothing you do in the game is shown to other players.
- The game shows ads from Google, which uses device identifiers or cookies. Where the law requires it, you are asked first.
- We do not sell your personal information.
- You can delete your account at any time in the game or by email: delete your account.
Who we are
Cozy Check is a game published under the name Black 4 Square. Black 4 Square is not a registered company: the game is developed by Daniil Denysov, an independent developer, who is responsible for your personal information (the "data controller"). In this policy "we" and "us" mean Daniil Denysov publishing as Black 4 Square.
This policy covers the Cozy Check app on Google Play (application ID com.black4square.CozyCheck), published by the developer account Black 4 Square, and the web version at daniildenysov.github.io/CozyCheck. Contact: contact@black4square.com, Daniil Denysov, Ukraine.
What we collect
Playing as a guest
Until you sign in, Cozy Check creates no account. Your progress, settings and room photos are saved on your device only. The game still asks our server for the current time, so that rent and daily gifts can't be fast-forwarded by changing the device's clock; that request carries nothing that identifies you.
Google sign-in (optional)
If you choose to sign in with Google, Google shares your email address, your name, your profile picture address and your Google account identifier with the game's account system, together with the sign-in tokens Google issues for it. We use them to create your account and link your progress to it. Each signed-in session also records the IP address and the device or browser description it was started from. While you sign in, a temporary record connects the sign-in to your device; it is deleted when the sign-in finishes, or within two days if it doesn't. Your name is shown only to you, in the game's Settings.
Cloud save
While you are signed in, the game uploads your progress so it is safe if you lose or change your device: your coins, Cozy Coins and hints, your building's name, which rooms you have finished, their stars and how you arranged and decorated them, and the timers for rent, daily gifts and room repairs. It is stored with the time of the last save. The game seals it, so it cannot be read or changed outside the game. The photos of rooms in your album stay on your device and are not uploaded.
Advertising
The Android app shows rewarded ads from Google AdMob, which you choose to watch (for example for the daily Cozy Coin). Where the web version shows ads, they come from Google AdSense for games. To show, limit and measure ads and to prevent fraud, Google processes information such as your device's advertising identifier or cookies, your IP address and details about your device and browser. Ads are personalised only where you have agreed to it or the law allows it. In the European Economic Area, the United Kingdom, Switzerland and some US states, Google's consent message asks for your choice, and you can change it later in the game under Settings → Your privacy choices. On Android you can also reset or delete your advertising ID in your device settings.
Technical information
Our service providers receive technical information when the game talks to them, such as your IP address, device or browser type and the time of the request, and keep it in their logs for security and troubleshooting. The Unity game engine may send Unity anonymous hardware statistics such as device model, operating system and graphics card.
Stored on your device
Cozy Check keeps your progress, your settings (sound, haptics, language), your room photos and your sign-in keys on your device, or in your browser's storage on the web. They stay there until you uninstall the game or clear the site's data. Settings → Reset progress clears your progress on the device.
How we use it and why
- To run the game, your account and your cloud save: this is necessary to provide the game you asked to play.
- To keep the service working and stop abuse, for example by limiting how often a save can be sent: our legitimate interest in a reliable and safe game.
- To show ads that pay for the game: your consent for personalised ads where it is required, otherwise our legitimate interest in funding a free game.
- To answer your requests: to meet our legal obligations.
Who we share it with
We use these service providers, which process information on our behalf or under their own policies:
- Cloudflare: accounts, sign-in and the cloud save database (Cloudflare Workers and D1). Privacy policy
- Google: Google sign-in, AdMob, AdSense and the consent message. Privacy policy, how Google uses data from apps and sites
- Unity Technologies: the game engine. Privacy policy
- GitHub: hosts the web version and these pages. GitHub privacy statement
Other players do not see your name, your progress or anything else of yours. We do not sell your personal information and we do not share it for any other purpose, unless the law requires us to.
These providers may process information outside your country, including in the United States. Where the law requires it, the transfer is protected by safeguards such as the European Commission's standard contractual clauses.
How long we keep it
We keep your account and cloud save for as long as your account exists. When you delete your account in the game, they are deleted immediately, together with your sign-in sessions; if you ask us by email, we delete them within 30 days. The records used to limit how often saves are sent are removed automatically within two days. Copies in our providers' logs and backups are removed automatically on their own schedules. Information on your device stays until you remove the game or clear its data.
Your rights and choices
You can ask us for a copy of your information, to correct it, to delete it, or to limit or object to how we use it, and where we rely on your consent you can withdraw it at any time. You can change your ad choices in the game under Settings → Your privacy choices, and sign out or delete your account in Settings. To make a request, email contact@black4square.com. We reply within 30 days. You also have the right to complain to your local data protection authority.
Deleting your account
You can delete your account and everything linked to it at any time: in Cozy Check, open Settings, tap Delete account under your account, type DELETE and tap Delete forever. The steps, and how to ask by email instead, are on the account deletion page.
Children
Cozy Check is not directed at children under 13, and we do not knowingly collect personal information from them. If you believe a child has given us personal information, contact us and we will delete it.
Security
Information is sent over encrypted connections. The game seals your saves, and it can only read or change its data on our server through checked functions, never directly. No method of storing or sending data is completely secure, so we cannot guarantee absolute security.
Changes to this policy
If we change this policy we will publish the new version on this page with a new effective date. If the changes are significant, we will also tell you in the game.
Contact
Black 4 Square (Daniil Denysov), Ukraine
contact@black4square.com