They're for playing puzzley games in real time.
Each of them has a pinned message to explain the rules of the game. Anyone is welcome to take part, and the room owners tend to be people who are particularly active players of the game (or, sometimes, bots whose automatic pinning powers are necessary for playing the game).
Contact
Codenames
Spyfall
Zendo
Detailed rules here on this meta thread - NEEDS MAKING!
Strupremum
Detailed rules here on this meta thread - NEEDS MAKING!
General notes
External research is not allowed in any of the games. This includes, for instance, if you are the defender in Contact or the SpyMaster in Codenames. No Googling, Wikipedia, etc.
There's been a generally adopted convention for waving in the rooms. Sending
O/
(capital O) means that you are able to play and can take the "leader" role in the game - such as defending in Contact, SpyMaster in Codenames, etc.0/
(zero) means that you are able to do the same asO/
but would prefer to be a normal player.o/
(lowercase o) means that you are able to play as a normal player but not take on, e.g., defending.It's generally recommended not to start pinging people to come play unless you have three or more people around and ready to play (or one below the minimum).