: The game is also available on GOG , providing a DRM-free version.
: You can buy the Developer's Cut on Steam, which features an optional "Developer Mode" that allows you to use in-game cheats and console commands.
While is not officially available as a free download, you can find the complete and updated version of the game for a very low price. The original 2009 release has been superseded by the Developer's Cut , which includes the base game and its expansion. Where to Buy Digitally