Chis Grant: So, lucky us, after the first full day of the show, you and I were the only pair to play Portal 2 together, cooperatively, without Valve. Valve writer Erik Wolpaw has been giving the the demo while playing as the second player, but he said he thought we looked like we could handle it on our own. Richard Mitchell: It was surprising to me how quickly we fell into step, actually. If you've played Portal before, it's kind of amazing how soon you start thinking cooperatively -- figuring out how you need two people to solve a given puzzle. It's a different experience, but it's still Portal.