Which innovative marketing strategy helped make George R.R. Martin's 'A Song of Ice and Fire' series a bestseller years BEFORE the HBO adaptation?

The publishing industry has evolved dramatically in its marketing approaches. From traditional book tours to innovative digital campaigns, publishers and authors have employed fascinating strategies to capture readers' attention in an increasingly crowded marketplace. Test your knowledge about the groundbreaking marketing techniques that have transformed books into cultural phenomena and literary sensations!

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The publisher released a free mobile app with interactive maps of Westeros and character genealogies
Martin wrote companion novellas from different character perspectives and released them in fantasy anthologies
A viral ARG (alternate reality game) where fans solved puzzles to unlock chapters of the next book
Limited edition books with actual dragon eggs (prop replicas) for the first 1,000 buyers