The system player triggered by the game doesn't appear in any browser.
The browser's system player allows you to control sound and video. To check the game, moderation launches it on mobile devices and desktop (for checking on a computer, make sure the player is enabled).
Checking on mobile devices
Launch the game. Then swipe down on the screen to open the notifications panel. Make sure that:
There is no player.
There is a player, but it's triggered by sound from another tab or application.
Checking on desktop
Enabling the player
Enable the system player in the browser settings.
Enable player in Yandex Browser
To enable the system player in Yandex Browser, in the upper right corner, select → Settings → Interface → General and enable the option Show a music and video control button on the toolbar.