Which marketing innovation helped J.K. Rowling's 'Harry Potter and the Philosopher's Stone' achieve its phenomenal initial success in bookstores?

The publishing world has seen some revolutionary marketing campaigns that transformed books into cultural phenomena. From clever retail strategies to iconic commercials, publishers have found innovative ways to connect readers with literature. Test your knowledge of the most successful marketing campaigns that helped certain books break sales records and become household names.

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Midnight release parties with themed decorations and costumes
The adult cover variants sold alongside children's editions
Pre-release book trailer commercials on television
Interactive reading apps bundled with physical copies