Which unexpected gaming industry merger resulted in the creation of Activision Blizzard in 2008?

In the competitive world of gaming, companies often merge to combine strengths and expand market reach. One particular merger in the gaming industry shocked fans and industry analysts alike, creating what would become one of the most influential forces in modern gaming. Test your knowledge about this significant business move that reshaped the gaming landscape and brought together two seemingly different gaming philosophies.

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Activision's $18.9 billion acquisition of Blizzard Entertainment from Vivendi Games
Electronic Arts' failed hostile takeover attempt of Activision, which led to Blizzard stepping in as a 'white knight' merger partner
Microsoft's temporary ownership of both companies before being forced to divest due to antitrust concerns
Tencent's silent majority investment forcing the merger of its two largest Western gaming subsidiaries