+ - Door
S - Secret Door

1 - Downward Staircase
2 - Upward Staircase
3 - Spiral Staircase (up/down)
4 - Excelsior Transporter
5 - Pit
6 - Teleporter
7 - Fountain
8 - Altar
9 - Dragon's Lair
a - Dragon, Guarding the Orb (The Orb with no Dragon in PC-DND)
b - The Orb (Magic Mirror in PC-DND)
c - Elevator
d - Throne
e - Treasure Vault
f - Solid Rock (Genie in PC-DND)