Portal: Maybe Black Mesa Map
Maybe Black Mesa By Sean M. firstname.lastname@example.org Installation: extract contents into "steamappsusernameportalportal" directory and access the map via the bonus map menu. A bonus map taking place in the reverse engineering department of t
Escape the Black Mesa reverse engineering department using the stolen aperture portal gun. It is not a learner's map or for beginners. Advanced techniques are definitely required to solve your way out of the facility.