Which game is widely credited with popularizing the 'microtransaction' model for cosmetic items (skins) that has now become a standard revenue strategy across the gaming industry?

The gaming industry has evolved far beyond simple entertainment, becoming sophisticated virtual marketplaces where real money changes hands for digital goods. The intersection of gaming and retail has created fascinating new consumer behaviors and market trends. This trivia question explores a key innovation in how game developers monetize their platforms through in-game purchasing systems. Test your knowledge about this important development in gaming retail strategy!

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Team Fortress 2 (2007) with its hat economy and item marketplace
World of Warcraft (2004) with its subscription-based model
Candy Crush Saga (2012) with its lives and boosters system
Grand Theft Auto V (2013) with its Shark Cards for in-game currency