Which gaming platform first introduced a comprehensive marketplace that allowed players to trade in-game items with real-world monetary value?

In the rapidly evolving intersection of gaming and e-commerce, virtual worlds have created entirely new retail ecosystems. From in-game purchases to virtual item marketplaces, gaming has pioneered innovative retail experiences that blur the lines between digital and physical economies. Test your knowledge about this fascinating frontier of digital commerce that has transformed how gamers shop, collect, and trade virtual goods.

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Steam (with the Steam Community Market in 2012)
Second Life (with Linden Dollars in 2003)
Xbox Live Marketplace (with Microsoft Points in 2005)
PlayStation Network (with the PlayStation Store in 2006)