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12TB Steam Data Leak Exposes Decades of Game Builds, Including Canceled Half-Life 2: Episode 3

August 30, 2026

Source Summary

Over 12 terabytes of data containing game builds uploaded to Steam between 2003 and 2013 have been leaked. The archive includes assets from canceled Half-Life 2: Episode 3, cut Portal 2 content, and an unreleased Portal universe game called F-Stop. Early builds of third-party titles including Call of Duty, Resident Evil, Mirror's Edge, Batman: Arkham Asylum, and Dragon Age: Origins have also been discovered in the leak.

Why it matters

The leak exposes unreleased game content and development history spanning a decade, potentially revealing proprietary game engine code and design decisions from major publishers.

What remains uncertain

The full contents of the 12TB archive remain unknown due to its massive size, and additional discoveries may emerge as analysis continues.

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