Which game is widely credited with pioneering successful large-scale virtual item sales, selling a virtual horse armor DLC that became a turning point for in-game monetization strategies?

The gaming industry has transformed from simple pay-to-play models to complex economies where virtual goods drive billions in revenue. Virtual item sales have become a cornerstone of modern gaming business models, particularly in free-to-play games. But this retail innovation didn't happen overnight. Test your knowledge about the pioneering product development that helped establish virtual goods as a legitimate revenue stream in gaming history.

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The Elder Scrolls IV: Oblivion (2006)
World of Warcraft (2004)
Second Life (2003)
Team Fortress 2 (2007)