Portal 2

Portal 2 puzzled through StreamerHouse in 2016, hitting 802 peak viewers for Valve's co-op brain-melter that won "Villain Most In Need Of A Hug" at the 2016 Steam Awards. Released originally in 2011, the game's co-op campaign remained StreamerHouse gold five years later—two robots (Atlas and P-Body voiced by Dee Bradley Baker) solving puzzles with four portals created exponentially bigger challenges than single-player. StreamerHouse viewers watched frustration mount as "two brains couldn't crack the puzzle," with the five official testing courses escalating difficulty across chambers that took players outside Aperture facilities by the finale. The community-voted Steam Award nomination proved Portal 2's enduring appeal, with GLaDOS's villainy softening just enough to earn sympathy despite murderous AI tendencies. Reviews praised "amazingly well constructed" puzzles more satisfying than single-player due to dual portal guns, calling it "a great brain workout" that tested coordination and communication. User-generated content via Steam Workshop kept the game alive years post-launch, with thousands of custom co-op chambers extending replayability infinitely. For StreamerHouse, Portal 2 represented Valve at their puzzle-design peak, creating cooperative gameplay so tight that 2016 audiences still gathered to watch friends struggle through mind-bending test chambers.