Which innovative marketing strategy helped make 'The Blair Witch Project of Books' a phenomenon, selling over a million copies before traditional advertising began?

The publishing industry has seen remarkable marketing campaigns that transformed books into cultural phenomena. Behind many bestsellers are innovative marketing strategies that broke traditional molds and created unprecedented buzz. This trivia tests your knowledge of groundbreaking marketing approaches that helped certain books achieve extraordinary success in the literary marketplace. Can you identify which revolutionary promotional technique launched a particular literary sensation to fame?

This is a live public trivia poll on AIPolls.Net. Vote and see real-time results.

The publisher of 'House of Leaves' created mysterious online forums where employees posed as readers dissecting the book's puzzles
For 'The Da Vinci Code', publishers sent cryptex puzzles to influential readers who had to solve them to access the book
'The Night Circus' campaign included a real-world scavenger hunt across major cities with prizes hidden in black and white striped packages
The 'Cathy's Book' campaign embedded real phone numbers and websites in the novel that readers could interact with in real life