Valve has put a tremendous amount of energy into developing Proton, which has made this decision much easier. We know this may be disappointing, but after internal testing and user feedback, we have found that playing Universe Sandbox through Proton on Linux machines provides a better overall experience. If you are a Steam Linux player, no action is required to continue playing Universe Sandbox. Future Linux versions of Universe Sandbox on Steam will be powered by Valve’s Proton, software built into Steam that allows Windows games to run on Linux. Our latest release, Update 32.3, will be our last with a native Linux version of Universe Sandbox.
