+<-------+--+--+
| |
+ +--+--+--+--+--+
| | | |
+--+ +-----+
| | \
| | 9
| |
+--+ +--+-o-+---+---+--+
| | | | | | o
| | | | | | |
+--+ +--+ + + + +
| | | 8 | | |
+ | o \| | o
| +--+ + +--+
| | |
+--+ +-----+-----+
| | |
+--+--+--+
8 = Sewers - Second Floor
9 = Dark Caverns & Demonia {50-130}
Here is the universal key.