Black Mesa
A new version of the Source engine had been introduced by that, in addition to new engine features, included support for OS X and Linux platforms, however, developers had to pay to gain access to the full feature set of this engine. Upon reaching the surface, however, he finds that the facility is being cleansed of any living thing - human or alien - by the military. Archived from the original on January 19, Archived from the original on September 10,