BradyGames along with FuturePress' "Portal 2 Signature Series Strategy Guide" includes the following: Multilevel walkthrough: Offers expert guidance while avoiding unnecessary spoilers - allowing mastery of the game without ruining the experience. Extended co-op coverage: Comprehensive walkthrough for the co-op game, including shortcuts and alternate solutions. Simplified isometric maps: As simple and clear as possible, but with as much detail as necessary - for a quick and easy understanding of the solutions. The Art of Portal: Stunning artwork shows Portal and Portal 2 in a simply breathtaking way. An audience with Valve: In-depth interview with the key figures behind Portal and Portal 2. Trophies/Achievements: Detailed step-by-step path to unlocking all 50 Trophies/Achievements. Exclusive videos: Countless gameplay videos show the pro techniques and strategies from the guide.
The interviews at the very end and the artwork are really what sold me on this. The writing is a bit clunky and odd at some points during the rehashing of the storyline, but it does its job for a game guide, in the sense that if you've got a question about something, it's got an answer. Seeing the timeline strung together was pretty handy, too.