A leaked archive stated to comprise round 12TB of outdated Valve improvement recordsdata, dated between 2003 and 2013, has surfaced on-line, and followers are already combing by it for any hint of the long-cancelled Half-Life 2: Episode Three.
The leak was first flagged on Friday by Twitter/X consumer Gabe Follower, who stated the archive included early variations of Portal 2, Left 4 Lifeless, and CS:GO, together with belongings from the cancelled Portal prequel F-Cease, and “probably” materials tied to Episode Three.
Somebody leaked 12 TB of Valve’s inner builds and sport belongings from 2003 to 2013. This contains early variations of Portal 2, Left 4 Lifeless, CS:GO, F-Cease and probably EP3. The neighborhood continues to be researching all the things, so the subsequent few days is perhaps insane… There is a Weaponizer… pic.twitter.com/Sg7OqJjL2X
— ‎Gabe Follower (@gabefollower) August 29, 2026
Up to now, the leak is assumed to comprise a 2009-era Portal 2 beta construct alongside a mannequin for the “Weaponizer”, a weapon beforehand related (if by no means confirmed) with Episode Three, although right here apparently repurposed as a placeholder asset inside Portal 2 itself.
Elsewhere within the archive, folks have recognized a completely playable Left 4 Lifeless beta construct dated June 2008, full with an early HUD, a work-in-progress foyer display, and reduce audio, together with strains initially recorded for Zoey by Alésia Glidewell earlier than Jen Taylor changed her within the closing sport.
The fabric reportedly comes from Valve’s outdated Steam2 content-delivery infrastructure, which the studio phased out in favour of SteamPipe within the early 2010s.
This differs from the cyber assault Valve disclosed earlier this month, when its European delivery associate, CEVA Logistics, was breached and {hardware} clients’ private particulars had been uncovered, moderately than any of Valve’s personal sport knowledge. Valve hasn’t commented on this newest leak.
With 12TB to work by, it’s going to seemingly be days earlier than the neighborhood has any clearer image of precisely what’s in there, Episode Three included.
We already had an inkling – if, admittedly, no particular affirmation – that Valve is engaged on a serious new Half-Life mission of some variety. After a reliable report in 2024 detailed datamined belongings, backing up a leak from an actor seemingly concerned, we had been informed the brand new Half-Life mission, codenamed HLX, was not simply in improvement however now “playable, end-to-end”.
What we do know for positive is Half-Life 3 was in improvement 2013/2014, and was set to be a procedurally-generated, replayable sport that fused Left 4 Lifeless-inspired gameplay with scripted story moments. It was cancelled as a result of it was constructed on the unfinished Supply 2 engine.