Which groundbreaking marketing campaign involved placing mysterious symbols in newspaper ads and urban locations months before the book's release, creating a viral puzzle that readers worked together to solve?

The publishing world has seen some remarkable marketing campaigns that transformed books into cultural phenomena. These campaigns didn't just sell books—they created movements, sparked conversations, and revolutionized how literature is marketed to the public. Test your knowledge of these landmark literary marketing strategies that changed both publishing and advertising history.

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• The Da Vinci Code's 'Cracking the Code' campaign by Dan Brown
• Harry Potter's 'Platform 9¾' guerrilla marketing by J.K. Rowling
• Fifty Shades of Grey's 'Submit to Desire' viral campaign by E.L. James
• The Hunger Games' 'Capitol Couture' transmedia experience by Suzanne Collins

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