The Cinderella story of id Software is matched by few others in the gaming industry. In just a couple years, the independent developer grew from a four-man band to one of the most influential studios in the world. The pioneers of the modern first-person shooter, and the champions of console-style gaming on the PC, id helped ride a new business model to the top of their field. As people mark the 18th anniversary of their independence this week, IGN looks back and the most prolific point in their career. Before Doom, before Quake, there were Commander Keen, Catacomb, and Dangerous Dave.