PC, Xbox 360 / Valve / 2011
Guessed by Scoobes
4 years after their little experiment that turned out to be awesome, Valve amplified everything with this huge sequel and made everything so much better. Portal 2 is one hell of a puzzle game and features a lot of new features and ideas after it's predecessor's success, even adding some platforming to some extent. The story was also very enjoyable with some stellar voice acting, and it just overall came together very well as an absolutely fantastic game and one of the best I've played - and the level editor in the PC version? That was amazing stuff. Here's hoping a Portal 3 happens sometime in the future, but knowing Valve I think it's somewhat unlikely, unfortunately.