I'm in the process of building a Descent tileset out of Hirst arts molds for our Descent group. The core game was easy and straightforward. However I'm looking at certain expansions (specifically RtL), and I'm noticing certain special tiles which I cannot find used in any dungeon.
For instance some of the corridors with built-in pit tiles in a checkered pattern. I don't see those in any of the dungeons in the RtL book. Are there certain tiles in the game which just never get used?