Which innovative product packaging technique revolutionized children's literature in the 1970s, allowing readers to make narrative choices that affected the storyline?

The world of book publishing has seen numerous innovations in product packaging over the years, from dust jackets to interactive elements. Publishers continually experiment with novel ways to make physical books stand out in an increasingly digital marketplace. This trivia question explores a groundbreaking packaging innovation that transformed how certain literary works were experienced by readers.

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Choose Your Own Adventure format with branching page numbers
Scratch-and-sniff embedded pages for sensory reading
Heat-sensitive ink revealing hidden story elements
Detachable character cards that unlocked alternate endings