You can find descriptions of each
element at the bottom of the page. The shaded quarter-circles at
the corners of rooms are speakers. The other marks are pretty much
self-explanitory.
A
Magic vending machine.
B
Elevator only accessible
from 3rd and 4th floors. This is how you Enter and Exit
the building.
C
Elevators. The
elevator in the middle of the building is a hidden platform that
is normally not used except in emergencies.