The maybeblackmesa.rar file you have requested: Maps Levels Missions / Portal: Maybe Black Mesa Map - 15.45mb is not available. Perhaps try browsing all files for the game Portal and upload any files you want to share or are missing. This is the only information we could locate:
Maybe Black MesaBy Sean M.email@example.comInstallation: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.