Angband

Angband
 n., /ang'band/

   Like {nethack}, {moria}, and {rogue}, one of the large freely
   distributed Dungeons-and-Dragons-like simulation games, available for
   a wide range of machines and operating systems. The name is from
   Tolkien's Pits of Angband (compare {elder days}, {elvish}). Has been
   described as "Moria on steroids"; but, unlike Moria, many aspects of
   the game are customizable. This leads many hackers and would-be
   hackers into fooling with these instead of doing productive work.
   There are many Angband variants, of which the most notorious is
   probably the rather whimsical Zangband. In this game, when a key that
   does not correspond to a command is pressed, the game will display
   "Type ? for help" 50% of the time. The other 50% of the time, random
   error messages including "An error has occurred because an error of
   type 42 has occurred" and "Windows 95 uninstalled successfully" will
   be displayed. Zangband also allows the player to kill Santa Claus (who
   has some really good stuff, but also has a lot of friends), "Bull
   Gates", and Barney the Dinosaur (but be watchful; Barney has a nasty
   case of halitosis). There is an official angband home page at
   http://thangorodrim.angband.org/ and a zangband one at
   http://www.zangband.org/. See also Random Number God.