Which gaming marketing campaign was the first to use an elaborate alternate reality game (ARG) that lasted several months and involved millions of players solving puzzles across multiple platforms?

In the competitive world of gaming, marketing campaigns can make or break a product launch. Some campaigns have been so innovative that they've become legendary in the industry, creating unprecedented engagement levels and setting new standards for interactive marketing. Test your knowledge about one of the most successful game marketing campaigns that revolutionized how games are promoted!

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I Love Bees (Halo 2)
The Beast (A.I. Artificial Intelligence)
Why So Serious? (The Dark Knight)
Portal 2's Potato Sack ARG