+x-------------x+
                            |                \
                            |                 +----+
                            |                      |
                            |                      +----+----+--+--+
                            |                                |     |
                            |        S--+--+      +  a       +     +
                            +           |         |\  ^      |     |
                            |        +--+--S   +<-+ b  +--+--+     +
                            |           |         |  v  ^          |
                            |        S--+--+    + +   \->a      +--+
                            |           |       |\|       v     |
                            |        S--+       + +        \    +
                            |           |       |           b    \
                  +         +--+        +--+--+ +                 2
                  |            |        |      \|              Caverns
               +--+--+--+      +--+--+--+       +              Level 1
     Mydgaard  |         \        |
      Sewer  1 +          +--+--+ |
      Fourth  \|                 \|
      Floor    +                  +

1 = Sewer (fourth floor) {5-30}
2 =  Dark Caverns and Demonia (cavern level 1) {50+}

Key to Mystic Adventure ASCII Maps