The Guardian said it was 'an astonishing experience.' GameSpy called it '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.' Now, Valve and Dark Horse pull back the curtain to give you a backstage tour of one of the most innovative video games of the decade! The Art of Portal 2 walks you through the visual evolution of the award-winning game, from concept to completion, with never-before-seen concept art a.
