From DoomWiki.org

Most of you guys probably figured out that I'm actually Doomguy 2000 the whole time. I have created such classics as: Doomguy's Warzone Gold Edition, 30,000 Levels, Millennia Invasion just to name a few. There's also the groundbreaking Doomguy's Warzone Platinum Edition which easily surpasses gold edition by far. Currently, I'm working on 100,000 Levels which is a sequel to 30,000 levels but was unable to do so five years ago.