Chell wakes up in a relaxation vault somewhere inside Aperture Science, a research facility that has been quietly falling apart for decades. GLaDOS is still here. The portal gun is still here. The puzzles, the sarcasm and the unsettling corporate cheerfulness are still here. What has changed is everything underneath.

Portal 2 expands the original game's portal mechanics into a full campaign of increasing spatial complexity, adding gel physics — Propulsion Gel for speed, Repulsion Gel for bouncing, Conversion Gel to place portals on any surface — that open the puzzle space in radical new directions. A complete co-op campaign follows robots Atlas and P-Body through their own test track, designed specifically for two players and requiring genuine coordination and spatial communication to solve. The story delves deep into Aperture Science's absurd history through Cave Johnson's pre-recorded monologues, voiced by J.K. Simmons, transforming what might have been optional background into one of gaming's great comedic performances. Stephen Merchant voices Wheatley.

Key Features: • Portal mechanics + three gel types: Propulsion, Repulsion, Conversion Gel • Full co-op campaign for 2 players with dedicated puzzles: robots Atlas and P-Body • GLaDOS: Ellen McLain - Wheatley: Stephen Merchant • Steam Workshop level editor - Compositor: Mike Morasky