Portal: Catalyst
PuzzleCaught in the crossfire of Portal's ending, return to the ever-expanding and changing Aperture facility from a brand-new perspective of a new Test Subject...
"After Chell defeats GLaDOS, a new and ancient menace threatens the Aperture labs as you and your core companion Fezz try to escape. Features XX new maps, brand new characters, and an epic adventure... On The Rails."
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