Half-Life 3 re-re-re-confirmed: A Valve dev just said 'HLX' out loud

Get ready to start talking about Half-Life 3 again, folks, because it's that time of year: Winter is closing in, The Game Awards are coming, and somebody at Valve said "HLX."

HLX, for those who haven't been following along, is a rumored codename for Half-Life 3, or Half-Life something, the near-mythical new Half-Life game that Valve may or may not be working on. It first came to light in early 2024, as part of a data string inside a Counter-Strike 2 update that bore a very strong resemblance to HLVR, Valve's codename for Half-Life: Alyx—a revelation that had PC Gamer contributor Rick Lane "vibrating with excitement."

Sadly for Rick, nothing came of it: No new Half-Life game, 3 or otherwise, followed, and HLX was filed away with all the other myriad Half-Life 3 rumors, hoaxes, and leaks. That is, until Valve composer and audio artist Mike Morasky brought it up completely out of the blue during a GameSoundCon panel on "Valve's Approach to an Open and Flexible Audio Engine."

In response to a question about managing voice counts—essentially the maximum number of sounds that can play simultaneously—Morasky touched on some of the variables involved, before touching on the role played by Valve's HDR system in optimizing audio. "Deadlock has their own version of HDR," Morasky says. "HLX has its own version, and so on and so forth."

Adding fuel to the fire, co-panelist David Feise, seated next to Morasky, immediately turned to him after the HLX comment and whispered "nice work," or possibly "nice one," obviously suggesting, hey man, you're not supposed to talk about that. Feise then quickly puts an end to the answer as Morasky laughs nervously, saying Groups, which Morasky had been talking about leading up to the HLX remark, "is its own one-hour talk, so come talk to us about that afterwards."

There's no question that Morasky said HLX, and that Feise reacted. In fact, at the end of the panel Feise leaned in and said, "Good job, you only said HLX once." Because this isn't the first time he's done it: Morasky appeared oh-so-close to saying "HLX" in 2025, although he was able to catch himself midway and shift gears, awkwardly, to "Alyx."

So HLX does seem to be a thing, but exactly what type of thing is anyone's guess. Maybe he's tripping over Half-Life: Alyx, or referring to some bit of internal tech, or maybe the whole thing is all just a put-on—Valve devs having a little fun with us. Or maybe it really is Half-Life 3! Nobody knows.

"Valve's Approach to an Open and Flexible Audio Engine" panel can be seen in full on Vimeo.