Which gaming platform first introduced a comprehensive virtual currency system that allowed players to purchase digital goods across multiple games with the same currency?

In the world of gaming, virtual economies have revolutionized how players interact with games and each other. From simple microtransactions to complex blockchain-based marketplaces, the way players purchase, earn, and trade virtual goods has transformed gaming business models and customer loyalty. Test your knowledge about this fascinating intersection of gaming and retail innovation!

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Xbox Live with Microsoft Points (2005)
Steam with Steam Wallet (2010)
PlayStation Network with PSN Credits (2008)
Nintendo with Nintendo Points (2007)