Portal 2

"Portal left you with some pretty big unknowns. Chief among them were, "What happens now?" and "How did that whole weird situation come to pass?" Portal 2 sets out to answer these questions, and in doing so travels both forward and backward from the conclusion of Portal. The result is a sequel that doesn't try to replicate the successful formula of its predecessor. Rather, it expands upon that original experience, creating something that feels initially familiar"

"Portal 2 makes the original look like the prototype it was. Its puzzles are challenging without being unreasonable, and, once you're finished with the single-player mode, one of the best co-operative experiences on the market awaits."

"Valve does it yet again with this mind-bendingly awesome sequel...Portal 2 is a near-perfect example of what can happen when all of the elements of modern game design are combined to create a beautifully cohesive whole."

"There is little reason not to experience Portal 2, especially for fans of the original. The graphics may not be of the same caliber of other AAA titles, and the story may falter from time to time, but those are paltry excuses not to experience one of the best current generation games around."

"Imaginative, challenging, hilarious and sometimes a bit exhausting, Portal 2 is one of 2011's most interesting, challenging blockbusters. Just make sure you take your sweet, sweet time with it - because you'll probably feel a hole in your head once it's done and dusted."