Massive 12TB Steam leak reveals decades of unreleased games — archived files include unseen Half-Life 2: Episode 3 builds and assets

Steam cover art .

Valve might've just suffered its biggest data leak in history, but it wasn't a hack or a security breach. Instead, the company left an endpoint to its legacy infrastructure accessible to the public, from where archivists extracted 12-13TB of old game content. The files are still being explored, but we know they include both Valve's internal projects and third-party releases, with an early weapon asset from Half-Life 2 Episode 3 being the key discovery, along with scrapped Portal 2 concepts.

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