Ubuntu Software Centre - First and possibly second commercial games!
Well like it or not Ubuntu Software Centre is here to stay in the Ubuntu distro.
With 10.10 it added supported for payed for apps and games which it has now had it's first game "Brukkon":
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Anticheat check - which competitive games actually work on Linux?
How to give Valve feedback when Proton games have issues on Linux / SteamOS