Use your phone as a gamepad in The Crowded Party Game Collection, sadly broken right now
The Crowded Party Game Collection, a game where you and up to 10 friends can take on 7 arcade-inspired mini games. The key thing here, is that you can use an iOS, Android or Windows phone device as a gamepad.
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Why some games on Linux, SteamOS / Steam Deck have broken videos and what you can do
How to install Battle.net on Linux, SteamOS and Steam Deck for World of Warcraft and Starcraft