Privacy policy
In short
The games contain no ads and no analytics tools. Most data stays on your phone only. I send my server only what is needed for the leaderboard and for two-player games over the internet – and only when you choose to use those features.
What stays on your device
Your game progress, stars, unlocked pictures, chosen language and settings. You delete them by uninstalling the game.
Web version (bystrohry.cz/sibenice/app)
You can play in the browser with no account, no ads, no analytics and no payments. Your progress and settings are kept only in your browser's local storage (clear the site data to delete them). Online features (leaderboard, two-player game) are optional: only when you open them, a random anonymous ID without e-mail or name is created and stored in your browser. The server then holds only this ID, the nickname you choose and your number of stars; I keep them until you delete them (Settings → Delete account and online data, or by e-mail).
XO Duel (bystrohry.cz/xoduel/app)
You can play XO Duel in the browser with no account, no ads, no analytics and no payments. Settings and statistics are kept only in your browser's local storage (clear the site data to delete them). Online play is optional: only when you open it, a random anonymous account without e-mail or name is created and stored in your browser. The server then holds only that account's ID, the nickname you choose (optional), the moves and results of games, trophies and head-to-head records. I keep running games until they end, finished games for 7 days, and the other data until you delete your account; your IP address is processed only briefly to protect against abuse. Players cannot write to each other; they only send fixed, ready-made animations. You can delete the account and all data right in the game (Settings → Delete account and data), or by e-mail. XO Duel is intended for players aged 10 and over. In the mobile app, a device token and the app language are also stored so that a notification can tell you it is your turn; they are shared only with Google Firebase Cloud Messaging, and notifications contain fixed sentences only.
BystroCube (bystrohry.cz/bystrocube/app)
You can play BystroCube in the browser or in the app without an account, ads, analytics or chat. Saved worlds and settings stay only in your device’s local storage. Online play with a room code is optional: only the character’s position and block changes are sent between players, never text, names or messages. The room runs on Cloudflare; block changes are kept only while the game is running and for at most 30 minutes after the last player leaves, then the room is deleted. Cloudflare processes the IP address only briefly to make the connection and protect against abuse.
Leaderboard (optional)
If you join the leaderboard, I store the nickname you choose and your number of stars on my server. The nickname is visible to other players, so please do not use your real name. You can ask me by e-mail to delete your entry.
Two-player game over the internet
In an online duel, the phones exchange the moves of the game through my server using a four-digit room code. The room disappears when the game ends, and I do not store the moves.
Who processes the data
My server and website run on Cloudflare infrastructure, which may briefly process technical data such as an IP address for security reasons. I do not sell data or share it for advertising.
Children
The games are suitable for children aged 7 and up. I do not knowingly collect personal data from children. I recommend that parents help their child choose a nickname that does not reveal their name.
Controller and contact
Miloš Hrušovský – Bystrohry, ID no.: 30203660
E-mail: podpora@bystrohry.cz
You have the right to access your personal data, to have it rectified and erased, and to lodge a complaint with your national data protection authority or with the Czech Office for Personal Data Protection (uoou.gov.cz). You can delete your account and online data (nickname, leaderboard entry) in the game: Settings → Delete account and online data. Or write to podpora@bystrohry.cz.