Over the weekend 12 terabytes of Valve's internal files went online: game builds and assets from 2003 through 2013. By Monday morning the archive had spread across torrents and a few thousand people were busy with the exact same task. They are looking for Half-Life 3 in it.
They have not found it. What they found is one weapon model, and two days later the theories are still being built around it.
What happened on the evening of 29 August
Gabe Follower, one of the best known dataminers working on Valve games, put it briefly: someone leaked 12 TB of Valve's internal builds and game assets from 2003 to 2013, including early versions of Portal 2, Left 4 Dead, CS:GO, F-Stop and potentially EP3. The community was still researching everything, he added, so the next few days might be insane. The post ended with the line that set the rest of it off: "There's a Weaponizer".
Within a day it had passed twenty three thousand likes. The archive got the name Steam2 Teraleak, after Valve's old storage system, and it was picked apart faster than anyone managed to say a word on behalf of the company.
Nobody hacked anything, which is the awkward part
The first reaction was the obvious one: Valve got hacked. Two and a half hours later the same Gabe Follower shut that version down himself.
No hacking involved, just verified that everything in Steam2 Teraleak was obtained via a publicly accessable endpoint. It's Valve's fault...
So nothing was broken into. The archive was sitting there in the open, no password, free to download.
This is Steam2, Valve's old content delivery system. It packaged game files into the formats Steam used before the move to SteamPipe in 2013. That is also why the archive stops dead at that year: after the migration nothing new was going into it. The system was never switched off, it was left running, and at some point it ended up with nothing guarding it.
To me this is a far more uncomfortable story than a break-in. A hack is somebody else's bad intent, and at least you know who to blame. A door left open for twelve years that nobody checked is about you.
What actually turned up
- Portal 2. Playable builds going back to July 2009, showing mechanics that never made it to release.
- F-Stop. The cancelled Portal prequel where the portal gun was replaced by a camera used to move objects and change their size. For years it existed as stories and a couple of screenshots. Now there are files.
- Left 4 Dead and CS:GO at early stages of development.
- Other people's games. Steam2 held content for everyone selling through the store, so studios with no connection to Valve are in there too. Among the finds are a beta of Sonic the Hedgehog 4 Episode II and files from Fallout: New Vegas.
F-Stop is the real prize here. Not an offcut, not concept art, but working assets from a project Valve shelved and never properly showed anyone.
The Weaponizer, and why it still is not Half-Life 3
All the attention went to one word. The Weaponizer is a weapon model the community has tied to the cancelled Half-Life 2: Episode 3 for years. It is genuinely in the archive, and several independent teardowns confirm it.
Then comes the part the headlines tend to skip. The model sits inside the Portal 2 files as a temporary asset, a placeholder standing in for something else. Nobody has found a playable Episode 3 build. Files marked ep3 do show up, but not one of them unpacks into a game.
Half-Life 3 is not in there and cannot be. The contents stop at 2013, and everything the current Half-Life argument is about happened well after that.
None of which stops anyone looking. Several catalogues of the finds went up on GitHub over the weekend, and every new filename with hl or ep3 in it starts another wave. So far it has produced exactly one gun.
Should you worry about your account
Short answer: no. There is no user data in the leak. No logins, no email addresses, no payment details, no libraries. Steam2 stored the contents of games, not accounts, and two days of digging have turned up nothing belonging to a user. You do not need to change your password over this.
What to keep in mind if you are tempted to go download it anyway:
- A torrent with that name is perfect bait. Nobody is going to verify twelve terabytes end to end, which makes slipping something in trivially easy.
- The files are still someone else's. An open endpoint did not make them free: the rights sit with Valve and third party publishers exactly as they did before.
- We are not linking to the archive. Same as we did not link to the stolen GTA 6 clips.
Valve has said nothing for two days now and probably will not. The community keeps digging, and I am fairly sure another couple of F-Stop grade things everyone had forgotten about will come out of it this week. Half-Life 3 will not be one of them.
Sources
The primary source for both claims is dataminer Gabe Follower's posts on X from 29 August 2026: the message about 12 TB covering 2003 to 2013, and a separate post two and a half hours later stating that no hacking was involved and the data came from a publicly accessible endpoint. The contents of the archive, the Portal 2 build dates, the F-Stop assets, the presence of the Weaponizer model inside the Portal 2 files and the absence of a playable Episode 3 build come from reporting by Engadget, GamesRadar, Dexerto and Insider Gaming on 30 August 2026. Valve's 2013 migration from Steam2 to SteamPipe explains why the archive ends where it does. The absence of user data and Valve's silence are confirmed by the same reporting, and there is no official comment from the company as this piece goes out. We do not publish links to the archive itself.
