It's one of the best games of the year, and certainly one of the more challenging from a puzzle perspective. A new batch of puzzles is now available with the Peer Pressure DLC, and you and a buddy can team up to locate the solutions. Sometimes, it's just more fun to brainstorm rather than do it all yourself. And by the way, Valve, we definitely want a Portal 3 at some point.
10/5/2011 Ben Dutka