Download and installation (Steam Deck) - xavier150/MMVS GitHub Wiki
Steam Deck
Warning: Steam Deck is not fully supported!
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First you need to switch to desktop mode.
Steam button -> Power -> Switch to Desktop

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Download the game from Patreon post or previous versions on the Game Site
Be careful to download the Linux game build and not the dedicated server.
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Extract the content of the Zip file.
Extracted content is the game folder. You can extract it to your Desktop or Downloads folder -
Find in the game folder the executable file MacroMicroVRService.sh (or Tag.sh) and in properties make it executable.

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Still in desktop mode add MMVS as "Non-Steam Game" in steam app.

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Now back to game mode using the icon "Return to gaming mode" or restart your Steam Deck.

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You can now find Macro Micro VR Service game in your Steam Deck Library.
Steam button -> Library -> Non-Steam -> MacroMicroVRService.sh (or Tag.sh)