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Question on online play
(lemmy.ml)
Steam is a video game digital distribution service by Valve.
Steam News | Steam Beta Client news
Useful tools:
SteamDB
SteamCharts
Issue tracker for Linux version of Steam
But how do you know?
Mostly you have to look it up on a per game basis. Probably just Google the game name and "supports cross play between" whatever platforms you want and someone will know