A patch is now available for Game Tycoon 2 on Steam adding Linux support to the game as detailed in this post (which isn't actually very detailed). This follows shortly after this announcement of the addition of Mac OS X support. Apparently more ports will follow: "We're very happy with the start of Game Tycoon 2 and are now looking forward to finish ports for other systems," explains Marco Sowa from Sunlight Games. "Moreover, we are planning to expand Game Tycoon 2 with some of the features, which were asked for by the community. Therefore we would be happy if the community continued to the discuss the game in the Steam forums."