Which bestselling novel's marketing campaign included a complex online puzzle that offered a real $10,000 prize to the first solver?

The publishing world has seen some truly innovative marketing campaigns that transformed books into cultural phenomena. From viral puzzles to elaborate scavenger hunts, publishers have found creative ways to captivate audiences beyond traditional advertising. Test your knowledge about some of the most successful book marketing campaigns that changed the publishing landscape and created unprecedented literary sensations.

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"Ready Player One" by Ernest Cline
"The Da Vinci Code" by Dan Brown
"S." by Doug Dorst and J.J. Abrams
"Mr. Penumbra's 24-Hour Bookstore" by Robin Sloan