09-02-2018 11:38 PM
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I did a bit of research and it looks like it depends on the developer and if they have implemented cross-platform play, either through GOG Galaxy or their own servers. So it would seem it's on a per title basis, I would search the forums on a particular title and see what others say.
RedRizla said:
@SimonSays28 - Do you know if I'm able to play multiplayer games with Steam friends?