// KOTAKU — GAMING
Every Valve Game Discovery So Far In The Colossal Steam Leak
At some point on August 29, roughly 13 terabytes of Steam depot data leaked online. It’s not an exaggeration to say that it is quite possibly the largest video game-related leak ever, as it contains prototype builds for an absurd number of games, including several first-party Valve releases like Portal 2, Counter-Strike: Global Offensive, and Left 4 Dead 2.
The full scope of the content included in the “Steam2” leak is hard to get a handle on at the moment, as people aren’t even finished cataloging all of its contents yet. What does appear to be the case, however, is that the depot files date from 2003 to 2013, and the nearly 13-terabyte torrent file going around contains builds of both third-party games and Valve’s own first-party titles.
As far as third-party games are concerned, there’s not a ton of concrete info out there yet. That’s probably because many people are currently busy poring over all of the content discovered just in the Valve prototype builds. To that end, here’s what’s been uncovered so far, keeping in mind that this story will definitely develop further over the next couple of weeks.
All right, let’s get this one out of the way first: before you get too excited, nobody has discovered a playable build of either Half-Life 3 or Half-Life 2: Episode 3 in this leak. However, while no mythical prototype build of either game has popped up, that doesn’t mean that the leak is fully devoid of Half-Life content.
The main discovery here is a model for Half-Life 2: Episode 3’s “weaponizer” gun. For context, in 2011, a few filenames related to Half-Life 2: Episode 3 leaked, including an “icegun,” a “flamethrower,” and three separate instances of a “weaponizer.” At the time, said discovery wasn’t that big of a deal—but then, Valve released the Half-Life 2: 20th Anniversary Documentary in 2024.
The Half-Life 2 Episode 3 weapon can be seen in the Portal 2 leak
We never see what it does in that Episode 3 footage… pic.twitter.com/hcljUUFGqJ
— Half-Life Alyx NoVR (@HL_Alyx_NoVR) August 29, 2026
And, lo and behold, it featured a few clips of weapons that were set to appear in Half-Life 2: Episode 3, including the aforementioned Ice Gun and a brief, blink-and-you’ll-miss-it clip of an unnamed weapon that the community believes is the fabled Weaponizer. This model pops up in the Portal 2 prototype build, although it appears to be a placeholder for a scrapped Paint Gun. There are also unconfirmed reports of filenames appearing in an “ep3” depot, but take those with a grain of salt for now.
Speaking of Portal 2, the discovery of at least two prototype builds of Valve’s 2011 game in the Steam2 files is easily the juiciest part of the leak so far. The 2009 version of the Portal 2 prototype is pretty rough, but if you’re a fan of concept versions of unfinished cutscenes and placeholder models, then you might find digging through this one interesting. For instance, here’s a very early version of the game’s intro sequence from the 2009 build.