Steam Data Dump Rewinds a Decade of Valve Prototypes and Game Assets
About 12 terabytes of Steam-era data (2003–2013) leaked, revealing game assets and prototypes from Valve titles such as an early Left 4 Dead build and data on the canceled Half-Life 2: Episode 3; the leak predates SteamPipe (2013) and contains only game data, not player data, with no post-2013 content, and Valve has not commented.
