With the Team Fortress 2 bundle of assets alone weighing in at 61GB, the leak - which features assets from Portal, Counter-Strike: Source, Team Fortress 2, Day of Defeat: Source, and Half-Life 2: Episodes 1, 2, and 2's multiplayer - features thousands of assets, some of which originate from modified or cut content.
According to PC Gamer, leaker Leakerwanderer appears to have disseminated the files on Discord, saying they'd had the files since 2016 but had held off sharing them because they were "threatened every time".
"I don't care anymore," the leaker reportedly said on Discord. "I also did my toying around with it for a few years, and did not upload because I was threatened every time.
the entire valve repo is leaking as we speek pic.twitter.com/aUlScUWEHDJanuary 12, 2023
"A real shame. I have no legal binding to these files. Not anymore.
"I have held onto these since 2016. Most of the file dates are from when I moved them after my computer blew up in 2019."
As the files are sanctioned asset libraries that Valve devs would share with third parties, you won't find any Half-Life 3 files in here, but it does give fans a chance to see asset art from their favorite games, and will likely be a goldmine to modders.
In case you missed it, a mysterious new Valve project popped up on Steam in the New Year.
On January 4, a new listing for something called Valve Event Upload was discovered on SteamDB. No, there's not that much information available right now, but the most important piece of the puzzle is that this is a 'Config' file - something only Valve itself can create.
According to Tyler McVicker, who has dedicated years to unpicking Valve's secrets, those 'configs' "are specifically done for large releases that [Valve] control". McVicker pointed out that the CS:GO team was making changes around the time that the Valve Event Upload listing dropped, whilst others wonder if it might be linked to the Neon Prime trademark that appeared last year. There's also hype that it may be 'The Orange Box 2', although there's no evidence of that at this time.
Keep up to date with all the best games set to launch next year with our guide to new games 2023.