Which marketing campaign is credited with transforming a relatively unknown book into a global bestseller by creating an interactive online puzzle that readers had to solve?

Test your knowledge about innovative marketing campaigns that transformed book sales and author popularity in the publishing industry. The landscape of literary promotion has evolved dramatically in recent years, with some campaigns becoming case studies in effective brand positioning and audience engagement. Can you identify which groundbreaking strategy truly revolutionized book marketing?

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The 'Da Vinci Code Quest' - a web-based puzzle competition tied to Dan Brown's novel that attracted millions of participants worldwide
The 'Hogwarts Acceptance Letter' campaign where personalized invitations were sent to potential readers of Harry Potter
The 'Gone Girl Diary' - an interactive blog written from Amy Dunne's perspective that released entries leading up to the book launch
The 'Hunger Games Training' virtual reality experience that simulated survival scenarios from the trilogy