Which retail expansion strategy did Valve implement in 2003 that revolutionized PC game distribution and eventually became the largest digital distribution platform for PC gaming?

The gaming industry has seen numerous innovative retail expansion strategies over the years, transforming how games reach consumers. From digital storefronts to physical retail locations, companies have continuously evolved their distribution methods. This poll tests your knowledge about a pivotal retail expansion move that significantly impacted the gaming landscape. Can you identify the correct retail expansion strategy that revolutionized game distribution?

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Steam - a digital distribution service allowing users to purchase, download, and automatically update games
Valve Arcade - a chain of physical gaming centers where players could test games before purchasing digital copies
The Orange Box - a subscription model where players received monthly physical game collections delivered to their homes
Half-Life Direct - a mail-order catalog system allowing players to order games directly from Valve via postal service