Which innovative marketing strategy helped propel 'The Da Vinci Code' by Dan Brown to become one of the bestselling novels of all time with over 80 million copies sold?

The publishing industry has seen remarkable product marketing strategies that transformed books from simple literary works into global cultural phenomena. From clever advertising campaigns to innovative retail partnerships, these strategies have propelled certain books to unprecedented commercial success while maintaining their artistic integrity. Test your knowledge of the marketing brilliance behind some of literature's biggest bestsellers!

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Creating an alternate reality game where readers solved puzzles online that connected to the book's themes
Publishing a special illustrated edition with hidden codes that readers could decipher for prizes
Releasing free 'webquest' materials to libraries and educational institutions that blended fact and fiction from the novel
Launching with signed first editions containing a unique symbol that granted access to exclusive author events