These are true for all of Oyg's maps

+ A Room
numbers Continuation to another map/area
LETTERS (CAPS) Special rooms. Meaning will be at bottom of map or from the list below.
letters (lower) A room marker. Used to show things that are difficult to draw. All rooms with the same letter are the same room. Typically only one will show the exits, if there are any. See examples.
-  |  /  \ Passages (exits). See examples.
%   = Passages cross, but do not intersect. See examples.
^  v  <  > One-way passages. See examples.
o Door, unlocked. See examples.
x Door, locked or magically protected.

Most of Oyg's maps (not all) use the following key

@ Temple F Food store
P Priest G General store
Y Priest and temple W Weapons
M Mystic Academy A Armor
H Fountain/Well (H20) R Repairs
D Donation Room C Cure store
B Bank S Store (other)

Examples 

Passages: East  West  North South    Up       Down

                        |           /  \
           +--   --+    +     +    + or +   + or +
                              |              \  /               +--+  +--+
			                                       /|  |  |  |\
                                   These look like they go    + +--+  +--+ +
                                   up or down, if you think   |/  /    \  \|
                                   in perspective.            +--+      +--+

Doors:  E-W    N-S  Up-Down

        +o-+   +       +
               o      o
               +     +

One-way
Passages: East  West  North  South    Up     Down

                         ^               ^
                      ^  |           ^  /
           +->   <-+  +  +   +  +   +  +    +   +
                             v  |            v   \
		                v                 v
                                        
Complex Situations:

    |            There is only one room a.  Going east
  --a--  b->a    from room b leads to room a, which has
    |            four exits.

          |\     On several maps I use constructs like this
     /\   |/     to indicate exits that go back to the same
    +-/   +      room.  In retrospect, it might be clearer if
                 I had used something like a->a. Maybe not.
            
            
Passage crossings:

   c
   |   Going east from a leads to b.
 a-=-b Going south from c leads to d.
   |   You cannot get from a to c.
   d

     c
    /  Going east from a leads to b.
 a-%-b Going down from c leads to d.
  /    You cannot get from a to c.
 d