Basically c/chat + c/gaming. Anything that increases socializing is good especially considering loneliness is on the rise in modern times.
The Lemmyverse chess event just ended https://lemmy.ca/post/292674 which is the most collaborative fedi gaming thing I’ve heard of.
Lemmygrad might have a video gaming together thing too.
List what multiplayer games you’re willing to play with other Fedizens.
Early I’m playing Dota2 (strong not recommended), Quacke Champion (recommended), Minecraft (strong recommended) and LoL (recommended 50/50)
Now I searched multiplayers crossplatform (windows, linux, console maybe) online games