D!Zone—a collection of nine hundred user-made Doom mods (which id obviously did not own); the D!Zone CD-ROM had, remarkably, surpassed Doom II to top the PC games sales charts, earning millions of dollars. It was a source of great consternation in the office—this was exactly what people like Kevin Cloud had been afraid would happen. In response, Romero initiated deals with a variety of mod makers to put out id-approved collections called The Master Levels for Doom II as well as one sprawling team project, Final Doom. They also put out a retail version of the shareware product Ultimate Doom.
