I played this solo with no issues noted on any of the three maps.
The many ladders you can't use were a bit irritating but it's just part of the game and many other authors have done the same.
Note some you can't initially use but later on you'll be climbing some. <G>
I did play the final map twice as I missed the key on the desk
when the door opened inward and I didn't see it behind the door. Note if you completely enter the room you'll see it and know what to do.
Second play through I was much more careful in checking out the rooms. So don't be in a hurry as you might miss something.
Thanks for creating this!
Chief
Decent Campaign