After The Death of GLaDOS, You are selected to be tested while the facility falls into disrepair. After Testing for a while, you find a control panel which gives the AI Testing you, The CCBAI (The Central Core Backup Artificial Intelligence) the ability to be self aware. As a thank you, The CCBAI helps you escape. However, you meet another test subject. Who gives you the question, "Do you really trust the CCBAI?". There are 3 endings, the "Up in Flames", "Escapees", and the easter egg ending.

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