A resistance fighter. A part-time employee. A squad of Combine Soldiers. A chase gone wrong.
Explore a post-GLaDOS Enrichment Centre, from the surface to it's murky depths. As Arin Spencer, together with Second Technician Jenn Wells, uncover a cavalcade of new environments, puzzle elements, tests and hazards, all while preventing the Combine from phoning home about what they've found down there. Remember, a lot of people are counting on you.
Outside Influence is a mod for the original Portal; a new story set within the shared Half-Life/Portal universe, with new testing elements, environments and music. Contains additional features, such as fully voiced audio logs that tell the stories of those who worked at Aperture Science in its last days, a togglable hint system and a zoom scope a la Portal 2.