Which gaming retail innovation did Valve introduce in 2003 that revolutionized digital game distribution?

The gaming industry has transformed retail in remarkable ways. From physical game stores to digital marketplaces, the evolution has been fascinating. This trivia question explores a pivotal moment in gaming retail history that changed how games are sold forever. Test your knowledge about the business side of gaming that shaped the industry we know today!

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Steam - The first major digital distribution platform for games
GamePass - The first game subscription service
Origin - The first publisher-specific game store
Battle.net Marketplace - The first integrated in-game purchase system