Massive 12TB Steam Leak Unearths Lost PC Gaming History, Including Half-Life 3 Assets

A colossal data leak, reportedly containing over 12 terabytes of information, has exposed a vast archive of PC gaming history from Steam, spanning from 2003 to 2013. The sheer volume of the leak means its full contents are still being explored, but early discoveries have already revealed significant finds. Among the unearthed data are assets related to the long-canceled Half-Life 2: Episode 3, as well as content that was ultimately cut from Portal 2.

This "teraleak" offers an unprecedented glimpse into the development of games during a pivotal decade for PC gaming. Beyond the high-profile Valve titles, the leak is understood to include builds of numerous other games uploaded to Steam during that period, potentially preserving abandoned projects and early versions of beloved titles. The incident raises questions about data security on the platform and the long-term preservation of digital game development history.