+
|
+
/
+-x+
|
o
+--+
| |
+--+
| |
+--+
| + +--+
o | |
+--+--+--+
|
+
|
+
|
+-----+--+
|
| +-+ +
| | |
| 7 +-+-+-+-+
| \ |
+-----+---+---+
7 = Sewers - Third Floor
Here is the universal key.