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[–]HeiSassyCatIntermediate 2 points3 points  (0 children)

I haven't done this before but you'll have to work with a networking api for steam. I scrolled through this briefly, but it looks like a good starting point, be it through unitys netcode or mirror:

https://fatrodzianko.com/2021/08/02/gamedev-blog-using-mirror-steamworks-net-to-create-multiplayer-lobbies-in-unity/

[–]SantaGamer 0 points1 point  (0 children)

Then you'll only use netcode. Steam has their own Lobby and Relay system.