Portal 2

videogamer.com review
I think you knew all along this was going to be great. Fantastic, even. All the same, I don't think you'll be prepared for it being this good. I may have buttoned my lip in terms of concrete spoilers, but a mere ten minutes here will yield more memorable moments than you're likely to squeeze out of the entirety of most other games this year. In all aspects of its design, Portal 2 is genius.
Read Full Review

guardian.co.uk review
Valve has created a masterpiece in Portal 2. The depth of content, the mind-bending mechanics and fantastic experience are almost certain to satisfy ardent fans of the first game; and to all newcomers to the series, it's as simple as this: prepare to have your mind blown. Over and over again.
Read Full Review

giantbomb.com review
Valve falls further down its own rabbit hole with this expansive sequel that retains the cynical heart of the original Portal, while blowing out the scale on virtually ever aspect of the execution.
Read Full Review

oxm.co.uk review
Still, it seems unreasonable to penalise a game for being so good you want to keep playing it. While you won't spend as long on Portal 2 as CoD, its shorter, more concentrated high is irresistible.
Read Full Review

1up.com review
There's so much I want to share with people, as well as so many things left to talk about, but doing so would spoil so much of the surprise and fun that is in this game. Suffice to say, Valve has managed to create a game that bests its predecessor in nearly every regard, and has demonstrated to the world that they still have what it takes to create a game that deserves the hype surrounding it. While it's unclear if we'll ever see GLaDOS or Chell again, this much is certain: Portal 2 is one of the best games of this generation.
Read Full Review