Which innovative product packaging concept revolutionized children's literature in the early 2000s by combining physical books with digital components?

Product packaging in the publishing industry has evolved significantly beyond traditional book covers. From limited edition boxed sets to innovative digital packaging solutions, publishers are finding creative ways to enhance the reader experience and differentiate their offerings in a competitive market. This trivia question explores a groundbreaking packaging innovation that transformed how certain literary works are presented and experienced by readers.

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LeapFrog's LeapReader system, which used specialized books with embedded audio chips
Augmented Reality (AR) book covers that animated when viewed through smartphone apps
Harry Potter Wizarding World interactive wand books that triggered digital content
Scholastic's 'Magic School Bus' interactive book-and-CD packages with synchronized content