I'm going to share this here as well, since when I mentionned it it seemed to be new for other people as well.
A little bit of trivia regarding Blood's Cryptic Passage's third map: Gothic Library.
At the end of the 2nd map, Old Opera House, you can see as an unreachable area the entrance of Gothic Library copy-pasted.
If you noclip and wander in it, you can see that some of the supplies were left in and not deleted:
However, the real interesting part is this staircase on the left of the main entrance, which does not exist in Gothic Library:
Mr. Fox pointed out this quote from the
Blood wiki:
Quote
"I worked on a commercial add on for Blood called Cryptic Passage. But don't ask me how you could get a hold of it. I don't even have a copy myself... I did the mine level, and the the library's exterior and first floor, as well as some technical stuff like making areas over areas and 'subways' work properly. I don't remember if I did anything else for it. The mine level is the better of the two levels as far as gameplay goes. The guy that finished the library level did so in one day, so a lot of the puzzles I'd planned for it, as well as the basement I think, got tossed by the wayside. But the library looks better. I modelled it after a local library which was built in the 1920's or something. Making the second floor visible from the first in the reception area was a real pain in the ass, because with that engine the 'sectors' in areas-over-areas had to be split up just right or you would get a hall-of-mirrors effect from the sector not being drawn. I think the issue was that you couldn't see a vertical slice of the first floor's walls at the same X as a vertical slice of the second floor's walls at the same time."
--Shawn Swift
Everything seems to indicate that this staircase led to this cut basement area and served as a b-entrance to the library.
The way it is constructed, as a door way with a sector going in, hints that there was a door there, probably either a double swing door opening inwards or a double slide door.
Furthermore, if in Gothic Library you noclip through the unreachable at the start corresponding to the end of Old Opera House, you can see a very similar thing: the inner rooms were deleted, so was the door, however the doorway was left.
Finally, while the staircase was cut in Gothic Library, the walls for it are still there:
It may also be worth noting that Gothic Library has 4 secret places while the max count indicates 3. Also, maybe it is just me, but I can never get 100% kills and am always missing 3 enemies. Both things may, or may not, also indicate the map was meant to be more than it is. I've always thought it was quite short compared to other maps in the add-on myself and lacked the "b-path" and "unlinearility" factors most of the other maps have.