Book excerpt: 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.