Some of the side passages and service areas for the larger complex known as the Crypt of the Tetris-Lords (which is largely in the areas following the wider hallways off to the top and right from this section). Entrance is from the passageway coming in at the bottom.
An early WIP post of this was jokingly titled “Crypt of the Tetris-Lords,” so I’ll stick with that. The image was scanned extra light in order to minimize the layout grid. I suppose it could be nice to keep the squares for counting out distances, but it reads really nicely without them, too. And, if you want to actually use this for a game, I think it’s tetris-y enough you can figure out most distances and dimensions pretty readily.
After posting the last map in this style, I learned that it is also referred to as “military projection.” It’s probably more correct to call this oblique projection (and you can make an accurate flat map from this by tracing the walls and edges).
As usual, feel free to use for any non-commercial purpose, or contact me if you’d like to use this on a commercial project.