Which marketing strategy was famously used for the 2007 launch of the final Harry Potter book 'Harry Potter and the Deathly Hallows' that created unprecedented anticipation?

The publishing industry has a rich history of innovative product launches for significant literary works. Publishers often use unique marketing strategies to build anticipation and create collector's items with first editions. Test your knowledge about some of the most notable book launches in literary history and the techniques used to make them cultural phenomena.

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Midnight release parties at bookstores worldwide with strict embargoes preventing early sales
Limited first edition copies containing actual gold leaf on page edges and hand-signed by J.K. Rowling
A global scavenger hunt where readers found pages of the manuscript hidden in major cities
Pre-order customers receiving personalized character illustrations based on a questionnaire