Valve watcher Gabe Follower flagged a Steam 12TB leak of Steam2 game files from 2003 through 2013. He says the dump holds builds uploaded to those old servers in that window. Valve has not commented.
Gabe Follower named early Portal 2, Left 4 Dead, and CS:GO builds. He also points to F-Stop assets and a Weaponizer model tied to Half-Life 2: Episode 3. Those last two claims are still being checked.
What’s inside the archive
Steam2 was Valve’s old content system. Then Valve switched to SteamPipe in 2013. As a result, the dump stops at that year. A public GitHub catalog now labels all 10,876 archived depot IDs. That list includes Valve titles plus Call of Duty, Fallout, and Civilization entries.
Gabe Follower posted a Portal 2 menu from a July 20, 2009 build. The screen still shows Aperture art and a developer console overlay. Meanwhile, a separate still shows an early Left 4 Dead session with a work-in-progress HUD.
He also posted one of the earliest CS:GO builds. The menu still reads Counter-Strike: Source. That matches his claim that the game started as a modified CS:S version.
However, the catalog marks many depots as unknown. One labeled depot can also hide extra betas inside. So the index is a map, not a full inventory. Besides Valve’s own games, third-party publishers sit in the same dump.
How the files reportedly got out
Gabe Follower later wrote, “No hacking involved, just verified that everything in Steam2 Teraleak was obtained via a publicly accessable endpoint. It’s Valve’s fault…” Because Steam2 used older depot formats, the files look like a time capsule of the platform’s first decade.
Still, it is unclear when someone first copied them. Valve has not confirmed a live server, an old archive, or the contents. The GitHub project also says it does not distribute Valve game payloads.
This leak is about old game depots, not a confirmed Steam account dump. This post does not link download mirrors. Also, do not treat unverified Episode 3 files as a new Half-Life announcement. Valve is still selling new hardware such as the Steam Frame and the Steam Machine. Those products sit on today’s SteamPipe stack.
