Which groundbreaking marketing campaign helped J.K. Rowling's 'Harry Potter and the Deathly Hallows' become the fastest-selling book in history with 8.3 million copies sold in its first 24 hours?

The publishing industry has seen remarkable marketing campaigns that transformed books into cultural phenomena. From midnight release parties to elaborate treasure hunts, publishers have found innovative ways to turn book launches into events that capture public imagination. Test your knowledge about some of the most successful marketing strategies that helped create bestsellers and literary sensations in the modern publishing world.

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The 'Midnight Magic' campaign featuring synchronized global release parties at exactly 12:01 AM, with bookstores staying open overnight and hosting themed events
The 'Wizard's Challenge' online scavenger hunt where readers solved puzzles across multiple websites to unlock exclusive content and pre-order opportunities
The 'Seven Horcruxes' campaign where seven celebrity readers revealed a chapter of the book each day leading up to release
The 'Potter's Pensieve' interactive experience where fans submitted their predictions for the final book that were displayed in bookstores worldwide