Long Before Friendslop, Portal 2 Made Co-Op Cool


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April 18, 2026 marks the 15-year anniversary of Portal 2’s release. Below, we reminisce about its memorable story, novel cooperative two-player mode, and enduring comedy.

There was a time in the PlayStation 3/Xbox 360 era when Valve was spoiling us with games, packaging some excellent titles in The Orange Box and bringing us back-to-back Left 4 Dead entries. But the company hit a stride with the 2011 release of Portal 2, which might be its finest accomplishment of that generation.

Following up from 2007’s Portal, Valve would still have had a hit if it had only made and released the single-player campaign, but the developers went the extra mile with the addition of a full-fledged co-op campaign–which itself would have been an equally worthy sequel to Portal on its own, and in retrospect, was a harbinger for cooperative and social games trending today.

That isn’t to undersell the single-player aspect, which is a huge expansion of the original game. Portal 2 is one of the smartest video game sequels ever, adding new dimensions to puzzle-solving with the special paint mechanics, and memorable characters like the JK Simmons-voiced Cave Johnson. It pushes the narrative forward with a newly cinematic flair, while taking an appropriately


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