Portal is a first-person puzzle game. Players must solve physical challenges by opening portals to maneuver objects, and themselves, through the enigmatic Aperture Science Laboratories.
A map with three version: basic, challenge and advanced.
Readme File: extract this file to the steam/steamapps/yourlogin/portal/portal folder.
Example: D:/Steam/steamapps/bluestrike@bluestrike.be/portal/portal.
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