anchor.diff:  247,X,Southeast Surface
   248,X,Southeast Surface
   249,X,Southeast Surface
  -250,,
  +250,X,Ronagan dungeon
   251,X,Southeast Surface
   252,X,Southeast Surface
   253,X,Southeast Surface
  
positive.code: 266,X,Volcano
  267,X,Cadomyr
  268,X,Akaltuts
  269,,
  270,X,Akaltuts
  271,,
  272,X,Southwest Mountains 1
  
negative.code: 232,X,Southeast Surface
  233,X,Southeast Surface
  234,X,Southeast Surface
  235,X,Fox Den
  236,X,Northern Islands
  237,X,Southeast Surface
  238,X,Southeast Surface
  239,X,Southeast Surface
  240,X,northern Islands
  241,X,Southeast Surface
  242,X,Southeast Surface
  243,X,Southeast Surface
  