Which gaming retail innovation first introduced the concept of 'microtransactions' that revolutionized digital game sales and in-game purchases?

The gaming industry has revolutionized retail with innovative shopping experiences both in-game and in physical stores. From virtual storefronts to immersive product launches, gaming retailers have pushed boundaries in digital transformation. Test your knowledge about a groundbreaking retail innovation that changed how gamers purchase their favorite titles!

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Team Fortress 2's Mann Co. Store (2010)
Horse Armor DLC in The Elder Scrolls IV: Oblivion (2006)
Steam's Community Marketplace (2012)
Xbox Live Arcade's points system (2005)