This is a book I read in the early 90s and I have almost no details. I just remember I found it at the school library, and it featured a kid finding a miniature city underground, and pricking his finger on an ornamental snake fang statue and passing out.
Stump the Bookseller
New format, same book stumper solving.
This is one of the books I was looking for that originally led me to Stump the Bookseller! Assuming we’re talking about the same book, it’s “Through the Hidden Door” by Rosemary Wells.
That’s what I would say too. I’ve used this website to find that same book too!