Which groundbreaking video game marketing campaign featured the fictional AI character IRIS, mysterious websites, and real-world treasure hunts that engaged players months before the game's release?

Test your knowledge about one of the most innovative and memorable advertising campaigns in gaming history. This campaign didn't just promote a game—it created a cultural phenomenon that blurred the lines between virtual and real-world marketing. The strategy utilized an elaborate alternate reality game (ARG) that engaged millions of players worldwide and set new standards for immersive product promotion in the gaming industry.

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Halo 3's 'Believe' campaign
Halo 2's 'I Love Bees' ARG
Call of Duty: Black Ops' 'There's a Soldier in All of Us' campaign
Portal 2's 'PotatoFoolsDay' ARG