Which innovative retail marketing strategy was MOST crucial to the initial success of the Percy Jackson book series?

Rick Riordan's Percy Jackson series brought Greek mythology to modern audiences with tremendous success. Beyond the compelling storytelling, the franchise represents a masterclass in mythology-based product branding and marketing. This poll explores how ancient myths were transformed into a contemporary retail phenomenon that spans books, films, merchandise, and theme park attractions.

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Positioning the books as educational tools that help children learn Greek mythology through modern storytelling
Using mythological creatures like Medusa and the Minotaur prominently on all book covers and merchandise
Creating an exclusive Percy Jackson mythology encyclopedia that was only available with first-edition purchases
Releasing limited-edition collectible character cards featuring gods and heroes with each book