12TB Steam leak reveals unseen Half-Life 2: Episode 3 builds

A publicly accessible endpoint released 12-13 TB of Valve’s Steam2 archives, containing early builds of multiple games. The dump includes a June 2008 Left 4 Dead version with alternate HUD and voice lines, a July 2009 Portal 2 beta with a different GLaDOS and placeholder assets, and a Half-Life 2: Episode 3 weapon model (“Weaponizer”) embedded in Portal 2 files. Early CS:GO assets such as an MP5-Active and Riot Shield, plus prototype UI elements for Left 4 Dead 2 and other projects, were also found.