Enormous 12TB Steam leak includes abandoned Half-Life 2: Episode 3 assets

Live updates

1. 14d ago

   12TB Valve archive leak exposes decade of Steam game data

   A 12TB archive of Steam data from 2003 to 2013 has leaked online, exposing thousands of lost game builds and scrapped projects. The leak includes first-party Valve assets, such as unseen builds of Half-Life 2: Episode 3 and early versions of Portal 2 and CS:GO, alongside third-party prototypes for titles like Mafia 2 and GTA 3. The data reportedly originated from a Steam2 server architecture and was available for public download without hacking. Valve has not yet commented on the breach.

   Why it matters

   The leak provides a rare look at the internal development history of some of the most influential PC games of the last two decades. It specifically highlights the abandoned work on Half-Life 2: Episode 3, a long-lost project of significant interest to the gaming community.

   What is confirmed

   • The leak consists of 12TB of Steam and Valve data.
   • The archived files span from 2003 to 2013.
   • The leak includes abandoned assets and builds for Half-Life 2: Episode 3.
   • The archive contains early builds of Portal 2.
   • The leaked data includes third-party game depots such as GTA 3 and Mafia 2.
   • The files were available for public download without the need for hacking.

   Still unconfirmed

   • The leak contains a beta build of Portal 2.

   What to watch next

   • Official comment or confirmation from Valve regarding the breach
   • Discovery of playable builds for Half-Life 3
   • Verification of the exact nature of the Half-Life 2: Episode 3 assets
   Sources used for this update (22)

   1. OpenCritic — Portal Fans Are Uh, A Little Obsessed With The Leaked GLaDOS
   2. Tom's Hardware — Massive 12TB Steam leak reveals decades of unreleased games — archived files include unseen Half-Life 2: Episode 3 builds and assets
   3. TechPowerUp — 12 TB Valve Archive Leaks Online, Fans Dig Through Early Portal 2 and Half-Life Clues
   4. Notebookcheck — Massive 12TB Valve leak just exposed a decade of gaming history and scrapped projects
   5. ixbt.games — Time to look for Half-Life 3 - Valve had a big build leak
   6. The Verge — Enormous 12TB Steam leak includes abandoned Half-Life 2: Episode 3 assets
   7. Ars Technica — A 12TB Steam “teraleak” spills more than a decade of lost PC gaming history
   8. ixbt.games — Rhythm Heaven Groove is back at number one in Japan - sales approaching one million
   9. Yahoo Tech — A massive cache of Valve data has reportedly leaked online, appearing to include Portal 2's elusive beta build and a potential weapon from Half-Life 2: Episode 3
   10. IGN — 12TB of Steam Files Leak as a Decade’s Worth of First- and Third-Party Game Data Is Exposed
   11. www.theverge.com — Markiplier is now GoPro’s biggest shareholder
   12. www.techspot.com — A massive Valve leak just exposed 12TB of old Steam data, no hacking required
   confidence 90%