If you already own Universe Sandbox ², just run Steam to update to the latest version.
Or you can buy Universe Sandbox ² here:
http://universesandbox.com/buy/http://store.steampowered.com/app/230290/What's new?Mac & Linux systems now support Native computation, which greatly improves physics performance. We’ve also fixed issues with the exploder tool, rainbow textures after planet transitions, magnetic properties not saving, and many other bugs.
We’ve got a lot of exciting things planned for Alpha 19 and the rest of 2016. Universe Sandbox ² is only going to get better. Happy New Year!
Complete List of UpdatesLet us know what you think! And please report any problems either with the in game feedback tool or by starting a new thread...