Which gaming company first introduced a widely successful virtual currency system that allowed players to purchase in-game items with real money?

The gaming industry has revolutionized how we think about digital transactions and virtual economies. Before cryptocurrency became mainstream, gamers were already familiar with purchasing virtual goods using digital currencies. This poll tests your knowledge about a pivotal moment in gaming payment history that changed how we interact with digital economies and virtual worlds.

This is a live public trivia poll on AIPolls.Net. Vote and see real-time results.

Valve Corporation with Steam Wallet (2010)
Linden Lab with Linden Dollars in Second Life (2003)
Blizzard Entertainment with WoW Gold (2004)
Sony Online Entertainment with Station Cash (2008)