Year: 2011
System: PS3, Xbox 360, PC

The hype for Portal 2 reached a fever pitch before its release, and Valve delivered big with this sequel. Besides continuing the story of Aperture Science, Chell and GlaDOS (whose razor wit has not diminished) Portal 2 introduced new characters into the fold, as well as improved puzzle mechanics while adding features like gels that would affect surfaces when sprayed with them. Throw in one of the best co-op campaigns in recent memory and you’ve a puzzle game even Gabe and company might have trouble topping.