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Massive 12-terabyte cache of internal Valve data leaks online

The leaked files, dated between 2003 and 2013, include beta builds and assets for several classic games and cancelled projects.

Updated Aug 30, 2026 · 14:24 UTC1 reports

The short version

  • A 12-terabyte archive of historical Valve game builds, assets, and code has leaked online from an unknown source.
  • The data includes early versions of Counter-Strike: Global Offensive, Left 4 Dead, and a highly sought-after 2009 Portal 2 beta.
  • The leak has been linked to Valve's older Steam2 server infrastructure, which was phased out in March 2013.

Key facts

  • A leak consisting of 12 terabytes of internal Valve data began circulating online from an unknown source.[Hacker News]
  • The files span a ten-year period from 2003 to 2013 and contain builds and assets for games like Counter-Strike: Global Offensive, Left 4 Dead, and Portal 2.[Hacker News]
  • The leak includes a complete 2009 beta build of Portal 2 that features pre-recorded GLaDOS test-chamber guides and different storyline elements.[Hacker News]
  • The files reportedly contain assets related to the Weaponizer, an unfinished weapon associated with the cancelled project Half-Life 2: Episode 3.[Hacker News]
  • Non-working assets are included for F-STOP, a cancelled camera-based puzzle game developed as a precursor to Portal 2.[Hacker News]

What remains uncertain

  • The original source and exact vector of the leak remain unknown, though the contents are linked to the defunct Steam2 server architecture.[Hacker News]

Sources