Which gaming company first implemented a successful integrated omnichannel strategy that allowed players to purchase games digitally and continue their progress across multiple devices?

The gaming industry has transformed dramatically in how products reach consumers. From physical cartridges in specialty stores to today's complex ecosystem of digital marketplaces, subscription services, and direct-to-consumer channels, gaming retail has pioneered omnichannel strategies. This trivia question explores a pivotal moment in gaming's retail evolution that changed how players discover and purchase games.

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Valve (with Steam Cloud in 2008)
Microsoft (with Xbox Live Marketplace in 2005)
Sony (with PlayStation Network in 2006)
Nintendo (with Nintendo eShop in 2011)