So i bought WMD without reading the "Multiplayer Notice: Multiplayer is available only between GOG users and requires GOG GALAXY." Well, my bad. However, as ZeeSvk pointed out, cross multyplayer between the Steam- and GOG- version should work with the latest update. I tried it with a frind (who has the Steam version): I can see him in the Lobby, he can see me, but we are unable to join each others games. Am I doing something wrong? Is there some kind of trick, or does corssplay still not fully work? Oh and singleplayer works fine of course and is as you would expect from a GOG-Game: no logging in, registration or other bullshit. Download, install, have fun.