Available at Amazon:
YOU choose from multiple paths that lead to different wacky adventures! You might end up finding the greatest treasure ever known, or you could send the twins and Blendin into an abyss from which they will never escape! This all-new Select Your Own Choose-Venture time-travel treasure hunt book features thrilling adventures, original artwork, and an exclusive double-sided poster! The book's author, Jeffrey Rowe, wrote episodes of Gravity Falls; Alex Hirsch, the creator of the show, provided additional story for the book; and the book's illustrator, Emmy Cicierega, was a storyboard artist for the show.