Which game first introduced the 'Steam Workshop' marketplace design that allowed players to create, sell, and profit from their own in-game items?

The gaming industry has revolutionized digital commerce through innovative virtual marketplaces and item stores. These platforms have transformed how players purchase, trade, and interact with digital goods, creating entirely new economic ecosystems within games. Test your knowledge about a groundbreaking virtual marketplace design that changed how gamers view in-game purchases and digital ownership.

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Team Fortress 2
Counter-Strike: Global Offensive
Dota 2
Garry's Mod