Which marketing innovation did Bloomsbury Publishing pioneer for the midnight launch of 'Harry Potter and the Goblet of Fire' that has since become standard practice for major literary releases?

In the world of publishing and literature, product launches are carefully orchestrated events that can make or break a book's success. Publishers use various strategies to generate buzz and excitement around new releases. This trivia question tests your knowledge about one of the most famous book launch marketing campaigns in recent literary history, which revolutionized how publishers approach major releases.

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Embargoed review copies with legal non-disclosure agreements for critics
Character-themed interactive websites with hidden content that required book purchase codes to unlock
Digital countdown billboards in major cities that displayed real-time sales numbers
Limited edition holographic covers that changed appearance based on reading progress