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.
This map takes place several minutes after Portal's events. Chell wakes up at the Aperture Parking Lot, among GLaDOS' remains. She's trapped by the fences, which prevent her from going outside. However, she can't climb them and her ASHPD is missing, so she's forced to return to Aperture Science to retrieve it. But it won't be as easy as she expects... To complete this map you'll need to use your best Portal skills, and be aware of everything around you. Don't be tricked by GLaDOS! Are you ready to return to Aperture?