I'm confused about something on the maps. Some of the corridors and rooms are separated by walls from the rest of the dungeon. As rooms 4, 5, 6 and 8 on the example map, Monastery of the Silent Dragon.
I assume those are rooms with secret entrances, where you have to figure out there's a room, how to find the entrance and then get through it?
Yes, @eunice-h is right - these are secret rooms separated from the rest of the dungeon by some kind of secret doors, which are drawn as thin walls.