In our game, there are pop-up notifications for different actions: incoming message, completing a job, getting a reward, etc.

If you want your browser to play an additional sound notification, you need to enable it in the settings to our site:

Likewise, you can turn it off.

Read the official documentation about 'Notifications to receive warnings':

• Chrome
• Safari

Be aware that on some browsers, you will not have an audible notification.