Which bestselling book series pioneered the use of interactive websites with hidden clues, real-world scavenger hunts, and viral marketing years before such strategies became common in publishing?

In the publishing world, innovative marketing strategies can make or break a book's success. Publishers and authors increasingly rely on creative campaigns to stand out in a crowded marketplace. This trivia question explores one of the most successful and groundbreaking marketing campaigns in modern publishing history that transformed a book into a global phenomenon and revolutionized how literary works are promoted to audiences.

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Harry Potter series by J.K. Rowling
The Da Vinci Code by Dan Brown
Twilight series by Stephenie Meyer
The Hunger Games trilogy by Suzanne Collins