Which video game marketing campaign created a fictional AI named 'Cortana' that sent mysterious emails to players and eventually became the inspiration for Microsoft's virtual assistant?

Test your knowledge about one of the most innovative marketing campaigns in gaming history! The gaming industry has seen some groundbreaking promotional strategies that changed how games are marketed forever. This campaign in particular created unprecedented buzz and community engagement through an elaborate alternate reality game (ARG) that blurred the lines between fiction and reality.

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Halo 2's 'I Love Bees' ARG campaign by Microsoft
Fortnite's 'Black Hole' event by Epic Games
Death Stranding's 'Tomorrow Is In Your Hands' campaign by Kojima Productions
Overwatch's 'Sombra ARG' by Blizzard Entertainment