Do we really want this in the app?

I can understand the reason of the bell sound on a desktop, since the user might be looking at another tab or application. But in the context of the application it is not really possible right now do to sth else while waiting for a game so the bell sounds redundant to me.

I saw this on the lichess beta group https://lichess.org/forum/team-lichess-beta-testers/mobile-app-alpha?page=11

Play a sound when exiting from the "Waiting for opponent to join..." screen, because an opponent has been found. Sometimes searching for an opponent can be a long wait. You cannot be staring at the screen all the time while waiting, so you get lots of aborted games because you missed the silent arrival of new opponent, risking the ban for too many aborted games

So basically, instead of looking at other tabs, people might be looking at real life while waiting :D

Once we support tournaments I think this becomes even more important, waiting for the next tournament game (in my experience) can sometimes take much longer than waiting in the normal game queue.

Right, I agree it makes sense to add it :)