Which bestselling novel's innovative digital marketing campaign included an interactive website where readers could solve puzzles that mirrored the book's plot, ultimately leading to a real-world treasure hunt?

The publishing world has evolved dramatically with digital marketing transforming how books reach readers. From social media campaigns to influencer partnerships, publishers and authors now employ sophisticated marketing techniques to stand out in a crowded marketplace. This trivia question explores a groundbreaking digital marketing campaign that revolutionized book promotions and set new standards for literary marketing innovation.

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Dan Brown's 'The Da Vinci Code' (2003)
Gillian Flynn's 'Gone Girl' (2012)
Andy Weir's 'The Martian' (2011)
Ernest Cline's 'Ready Player One' (2011)