GLaDOS, still bitter about her previous defeat, separates Chell from Wheatley and forces her back into a series of grueling tests while she rebuilds the facility. The Great Betrayal
In a surprising show of "mercy," GLaDOS decides that killing Chell is too much trouble. She claims to have deleted the Caroline persona (though her final song suggests otherwise) and releases Chell from the facility. Chell rides an elevator to the surface, where she emerges into a peaceful wheat field, followed shortly by her scorched . com/wiki/Cave_Johnson">backstory of Cave Johnson ? Portal 2 In 6 Minutes Portale 2
Wheatley eventually helps Chell escape the test chambers. Together, they sabotage GLaDOS's turret and neurotoxin production lines. They confront her in the central control room and perform a "core transfer," replacing GLaDOS with Wheatley. GLaDOS, still bitter about her previous defeat, separates
Remembering that moon dust is a perfect portal conductor, Chell fires a portal directly at the . The resulting vacuum sucks Wheatley and the "Space Core" out into orbit. GLaDOS regains control of the facility and pulls Chell back to safety. The Ending Chell rides an elevator to the surface, where
They return to the modern facility to find Wheatley has made a complete mess of things, pushing the reactor toward a core meltdown. In the final battle, Wheatley booby-traps the room, but Chell notices the roof has been torn open, revealing the night sky.
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