Which gaming marketing strategy was the first to use an alternate reality game (ARG) that involved millions of players solving puzzles across multiple platforms before the game's release?

Test your knowledge about groundbreaking marketing strategies in the gaming industry! The gaming world has seen some revolutionary marketing campaigns that changed how games are promoted and experienced by players. From alternate reality games to interactive global events, marketing in gaming has evolved far beyond traditional advertising. Can you identify which of these innovative campaigns made gaming history?

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Halo 2's 'I Love Bees' campaign (2004)
World of Warcraft's 'Corrupted Blood Incident' (2005)
Portal 2's 'Potato Sack' indie game collaboration (2011)
Fortnite's 'Black Hole' event (2019)