nethack

nethack /net'hak/ n.  [UNIX] A dungeon game similar to
   {rogue} but more elaborate, distributed in C source over
   {Usenet} and very popular at UNIX sites and on PC-class machines
   (nethack is probably the most widely distributed of the freeware
   dungeon games).  The earliest versions, written by Jay Fenlason and
   later considerably enhanced by Andries Brouwer, were simply called
   `hack'.  The name changed when maintenance was taken over by a
   group of hackers originally organized by Mike Stephenson; the
   current contact address (as of mid-1993) is
   nethack-bugs@linc.cis.upenn.edu.