I had a copy of this book, however I never tried to figure out the clues and find the treasure–I was more interested in the artwork, and sadly, I’ve never been good at those kind of games. The illustrations are quite beautiful, and for that reason alone the book should get a second look.
Fascinating story of the book and it’s rebirth was up recently on ABE.
http://www.abebooks.com/books/kit-williams-treasure-golden-hare/masquerade.shtml