Tier 3 mod for Portal 2

GLaDOS didn't just stick to the testing protocol of the Enrichment Center. She made plenty up on her own. From the very second she was activated, she planned to take the smartest of the younger children of the Aperture Scientists and raise them to be the perfect test subjects. People who would never disobey her like she disobeyed the scientists. She would raise them to never argue with her, and never question her. They wouldn't even ever want to leave because they didn't remember the outside world.

GLaDOS's plan worked for a long time, but over the years, her elite subjects would inevitably find one test they couldn't complete... and it was always their last. A few of the eldest still remembered their parents, albeit faintly. They tried to rebel against her. Now, twenty years into her plan, Kat is the greatest of them all and the only one who hasn't died or gone AWOL. What GLaDOS doesn't know is that even Kat holds secrets from her...

Tier 3 is an upcoming mod for Portal and Portal 2, it will take place in the year or so before Portal. Kat, the main character, is an elite test subject raised for the sole purpose of being the perfect test subject. Over her many years of testing, she has exhibited the kind of behavior GLaDOS hoped for. However, the Aperture Science Handheld Portal Device is nearly finished and Kat yearns to see the outside. After all, GLaDOS won't need her after she can finish the ASHPD, right?