-Unprecedented access behind "Half-Life" and "Half-Life 2"
-A forward by Valve founder Gabe Newell
-Hundreds of art, design, preproduction, and other art pieces crammed into the book
-Over a dozen key members of Valve's staff interviewed
-Officially approved by Valve
-Behind City 17 and other locations
-The development of the Source engine
-A rogue's gallery of beasts, characters, and monstrosities
-Key weapons development revelations
-A tour of many of the game's locations, from inception to co...