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At PAX East last Saturday, I got a chance to awkwardly speak to Portal 2's project lead, Joshua Weier. Despite my woeful incoherence, I learned a few interesting tidbits about the game's inception, including that Valve isn't ready to divulge the nature of a new puzzle mechanic which it scrapped early on in development.
In an interview with The Telegraph earlier this month, Valve writer Erik Wolpaw explained, "... a brief idea we had was having a different puzzle mechanic, with each Portal game introducing a new way of solving puzzles with Aperture Science in the background, this big funhouse where every game would get a new thing. We quickly discovered through playtesting that people liked it, but just preferred the portal gun."
