Portal

Portal video games gladOS - 7366113536
By Rattmann (Via Potados)
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...when you have an Aperture-Neurotoxin-Activation Card

conversion indie games Portal Video Game Coverage - 7958292736
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From the game description:

We all know what happens; Chell deactivates GLaDOS, gets put in extended relaxation only to be reawakened years later to fight again and escape. But what really happened in Aperture Science during the intervening years? Have you ever wondered: Why does Aperture look so different in Portal 2?