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12TB Steam data leak exposes unused Half-Life 2: Episode 3 and Portal 2 content

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GoKawiil Brief

A massive 12-terabyte leak containing builds of nearly every game uploaded to Steam between 2003 and 2013 has surfaced online. Researchers combing through the trove have already found scrapped assets from the canceled Half-Life 2: Episode 3, cut Portal 2 material including alternate dialogue and intro sequences, and early builds of titles like Call of Duty, Resident Evil, Mirror's Edge, and Dragon Age: Origins.

Why It Matters

GoKawiil's interpretation of the reporting above, not reported fact.

This leak offers an unprecedented look into the development history of major franchises, revealing scrapped ideas and unreleased projects that studios never intended the public to see. It also raises concerns about data security on Valve's platform, since developer builds spanning a decade were apparently exposed all at once.

Key Takeaways
Worth a Look

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Source: theverge.com — Terrence O'Brien, 2026-08-30

Published there as: “Enormous 12TB Steam leak includes abandoned Half-Life 2: Episode 3 assets”

Read the original report → The summary and analysis above are GoKawiil's own, written from reporting by the source above. Facts and quotes belong to the original publisher.