Which bestselling novel series pioneered the use of alternate reality games (ARGs) as part of its marketing campaign, creating an immersive online experience where readers solved puzzles across multiple websites?

The publishing industry has evolved dramatically in its marketing approaches. Major book releases now involve sophisticated advertising campaigns that rival those of blockbuster movies. Publishers use everything from viral marketing to immersive experiences to captivate readers. This trivia question explores one of the most innovative and successful book marketing campaigns that changed how literature is promoted in the digital age.

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The 39 Clues series (Scholastic)
The Hunger Games trilogy (Suzanne Collins)
A Series of Unfortunate Events (Lemony Snicket)
The Maze Runner series (James Dashner)