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In July 2016, Hirsch threw a global treasure hunt (known as "Cipher Hunt") for "Gravity Falls" fans with clues hidden throughout the world including in the United States, Japan, and Russia. The goal of the hunt was to find a statue of the "Gravity Falls" character, Bill Cipher. After two weeks, fans of the show discovered the statue in Reedsport, Oregon. The hunt coincided with the release of Hirsch's tie-in book, "Gravity Falls: Journal 3", which was released on July 26, 2016 and eventually became a No. 1 "New York Times" Best Seller and appeared on "The New York Times" Best Seller list for nearly a year. Due to the successful sales of "Gravity Falls: Journal 3", a special edition of the book was released on June 13, 2017 and limited to 10,000 copies. The "Gravity Falls: Journal 3 Special Edition" contains blacklight writing, parchment pages, a monocle, removable photos and notes, and other features that were not included in the regular edition of the book.