Nathan Grayson of RockPaperShotgun writes, "The first time I ever played Portal was damn near magical. Each room I walked into held promise of some diabolical new assault on both my brain and the laws of physics, but I made them look like child’s play. At the time, I was certain it proved I was a genius with an IQ so huge that even my bulging genius brain couldn’t count that high. Of course, I soon came to find out that everyone experienced Portal that way. So I wasn’t a genius. But the puzzle designers at Valve were."