Valve Developer Appears to Let Slip ‘HLX’ Codename During Audio Panel

During a recent developer panel held at GameSoundCon on October 21, long-time Valve composer Mike Morasky appears to have inadvertently confirmed the existence of an unannounced project. As reported by Kotaku, the slip occurred while Morasky was joined by Valve sound designers David Feise and Carlye Nyte for a discussion regarding the flexibility of the Source 2 engine’s audio capabilities. When explaining how the engine integrates across various titles, Morasky stated: “And in fact, I think Deadlock has their own version of HDR. You know, HLX has its own version, so on and so forth.”

While “Deadlock” is a recognized Valve title, “HLX” is not. The term has circulated for over five years within the community, originating from extensive datamining efforts by fans who believe it serves as the internal, non-public codename for the long-rumored Half-Life 3. The mention was notable enough that fellow panelist David Feise was heard whispering “Nice work” immediately after the comment, suggesting the reference was a breach of protocol. Morasky has previously slipped up by mentioning he worked on more than one Half-Life title, despite only being officially credited with 2020’s Half-Life: Alyx.

The casual nature of the comment suggests that “HLX” is deeply ingrained in the developer’s internal vernacular, to the point where Morasky may have simply forgotten that the project remains officially unannounced. For years, dedicated fans have compiled a massive catalog of information regarding the project’s mechanics and development progress. Industry reports from 2025 indicate that the project is significantly advanced in its development cycle, with claims suggesting it is already playable from start to finish.

At this stage, Valve has not provided an official statement regarding the incident, nor have they acknowledged the status of the project. Observers are now looking toward major industry milestones, such as The Game Awards in December, for any sign of a reveal. Players should continue to monitor official Valve communications for updates, as the company has maintained total silence on the matter to date.

Why it matters

For the gaming community, this unexpected mention is the strongest indication yet that a new mainline entry in the iconic Half-Life series is in active development. Given that the codename has been a fixture of datamining leaks for half a decade and current reports suggest the game is in a playable state, the slip highlights just how far along the project may be. While speculation regarding a potential announcement at upcoming industry events is intensifying, the incident serves as a rare, albeit accidental, window into the secretive internal development pipeline at Valve.