### add personal history here



See Recreational Computing, July 1980:
  http://archive.org/details/1980-07-recreational-computing


And an interview with Joe Powers:
  http://www.armchairarcade.com/neo/node/1381


An interesting derivative of the game, providing several modes of play:
  http://ifarchive.heanet.ie/if-archive/games/source/inform/wcastle.inf