Which game is widely credited with pioneering the 'microtransaction' model for cosmetic items in a major mainstream title, setting the stage for modern in-game purchase systems?

The gaming industry has transformed retail through innovative monetization strategies. Virtual storefronts and in-game purchases have revolutionized how developers generate revenue beyond initial game sales. This innovation has shaped modern gaming economies and player experiences, creating billion-dollar ecosystems within virtual worlds. Test your knowledge about the origins of this retail innovation that changed gaming forever!

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Team Fortress 2 (2007) with its 'Mann-Conomy Update' that introduced purchasable hats and weapons
World of Warcraft (2004) with its first purchasable mount, the Celestial Steed
The Elder Scrolls IV: Oblivion (2006) with its controversial 'Horse Armor DLC'
Counter-Strike: Global Offensive (2012) with its weapon skin marketplace