Which gaming partnership created the first widely successful subscription-based MMORPG that maintained over 10 million subscribers at its peak?

The gaming industry has seen numerous strategic partnerships that revolutionized virtual worlds and gameplay experiences. These collaborations between game developers, tech companies, and even non-gaming brands have shaped the landscape of modern gaming. How well do you know the historic partnerships that transformed the gaming marketplace? Test your knowledge of the business side of gaming!

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Valve and Sierra Entertainment (Half-Life)
Blizzard Entertainment and Vivendi Games (World of Warcraft)
BioWare and Electronic Arts (Star Wars: The Old Republic)
Square Enix and Sony (Final Fantasy XIV)