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You could try one of these:

  • Build Mac versions on a Mac and Linux versions on Linux. Ugh.
  • Use .NET Core (template here) to build self-contained releases that run on Windows, Mac, or Linux without requiring .NET Framework. This is pretty cool, but was honestly a nightmare for me to setup and I cannot describe it all here.
  • Port your game from MonoGame to FNA. (Shouldn't be difficult.)
  • Use MonoKickstart to package Mac and Linux runtimes with your game.