Valve's Portal 2 is a smash hit, scoring virtually 100-percent in all reviews. There's not much to say about the game unless you haven't heard of it - if you're one of these people, there are some steps you require right now. Stop what you're doing, open Steam (and if you don't have it, GET IT), find Portal 2, purchase. This is all you need to do to enjoy happiness.

As for reviews, I've provided a bunch of links below:

Techland - 10/10
Guardian.co.uk - 5/5
Giant Bomb - 5/5
Telegraph.co.uk - 10/10
VideoGamer - 10/10
GamePro - 5/5
Strategy Informer 10/10
OXM - 10/10
Eurogamer 10/10
GameInformer - 9.5/10
The Escapist - 4/5
GameSpot - 9/10
GameTrailers - 9/10
CVG - 9.3/10
IGN - 9/10
PC Gamer - 94%