WHAT IS CROSSFIRE?

  This is a multiplayer graphical arcade and adventure game made for
  the X-Windows environment.

  It has certain flavours from other games, especially Gauntlet (TM)
  and Nethack/Moria.

  Any number of players can move around in their own window, finding
  and using items and battle monsters.  They can choose to cooperate
  or compete in the same "world".