12 terabytes of Valve Corporation’s internal game builds and assets from 2003 to 2013 have been leaked on Steam.
The massive Steam leak (via RefreshingCapybara on Reddit and gabefollower on Twitter/X) appears to span a decade of Valve’s development history, encompassing numerous game builds, beta versions, dedicated servers, development tools, shared assets, localization files and other material associated with some of the company’s most influential games.
The depot reveals entries for the original Half-Life and its expansions, Counter-Strike, Team Fortress Classic, Day of Defeat, Deathmatch Classic, Ricochet and Counter-Strike: Condition Zero. It also contains numerous Half-Life 2 builds and related files, including Lost Coast, Episode One and Episode Two, alongside Source Engine runtimes, Source SDK components, models, sounds and shared content.
Valve’s later Source-era projects have also a part of the leak, including multiple Team Fortress 2 builds and beta entries, Portal and Portal 2, Left 4 Dead and Left 4 Dead 2, Alien Swarm, Dota 2 Workshop Tools and Counter-Strike: Global Offensive.
There are also entries labeled as beta content, demos, authoring tools, dedicated servers and shared components. Counter-Strike: Source, for example, appears alongside multiple regional localization packages and several beta engine/content entries. The archive also appears to extend beyond Valve’s own games. The depot also includes builds and assets associated with numerous third-party titles distributed through Steam, ranging from Vampire: The Masquerade – Bloodlines and Call of Duty to The Ship, Shadowgrounds and Neverwinter Nights 2.
It’s worth clarifying that no hacking was involved in this repository leak, as everything it contains was obtained via a publicly accessible endpoint. It was, therefore, an error on Valve’s part. This may rank among the largest gaming leaks ever documented, not only because of its size, but because of the massive number of games builds and assets it contains. The community is still in the process of going through all the files, and there may be hidden details waiting to be discovered.
