Darker Realms is a MUD, a multi-user text-based role-playing game, set in a medieval fantasy world. Operating since June 1990, it was one of the first LPMuds to open, and is the oldest continually running LPMud in the United States and the second oldest in the world (after Genesis LPMud). It was also the first MUD of any kind to feature a quest-based advancement system. It has been described as "one of the largest MUDs on the Internet".
Game characteristics 
DR maintains many of the classic elements of an LPMud, as well as several very distinctive guilds, original quests of varying difficulty, text versions of over a dozen card and board games, and a good number of more modern features such as built-in colors and aliases.
- Reese, George (1996-03-11). "LPMud Timeline". Retrieved 2010-04-23. "1990 ¶ Darker Realms opens."
- Schiesel, Seth (1997-07-07). "The Ins and Outs of Playing Games Online". The New York Times on the Web. Retrieved 2010-06-15.
- van den Broek, Dennis (2008-08-27). "Strafrecht in virtuele werelden: Een onderzoek naar de toepassing van het Nederlandse materiële strafrecht op virtuele werelden" [Criminal law in virtual worlds: An investigation into the use of Dutch substantive criminal law in virtual worlds] (in Dutch). Tilburg University. Retrieved 2010-09-18. Unknown parameter