Which gaming platform first introduced a comprehensive virtual marketplace that allowed independent developers to sell their games directly to players, revolutionizing digital retail in gaming?

The gaming industry has transformed retail experiences through virtual marketplaces and in-game economies. These digital retail environments have created entirely new business models worth billions annually. Test your knowledge about a groundbreaking retail innovation that changed how gamers purchase and experience content in virtual worlds.

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Steam (Valve Corporation, 2003)
PlayStation Store (Sony, 2006)
Xbox Live Marketplace (Microsoft, 2005)
App Store (Apple, 2008)