This was longer than initially expected! I bumped my head in surprise when the librarian revealed she was stuck, too. Maybe let her know about the passage before leaving? Very nice.
conversion... really? You know I'm dumb.
Quick and just challenging enough to be fun but not frustrating.
Backgrounds in the library almost the same. It took me quite some time to find a slot for an old book. And thanks to the walk through, I totally missed the black key and wanted to give up.
I enjoyed the underground adventure, but it was short.