
Everybody panic: A Valve developer said "HLX" in public
Sound designer lets Half Life-related codename slip at a conference.
via Ars TechnicaReported by 2 outlets
The story so far
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Valve composer and audio artist Mike Morasky let slip the codename "HLX" during a game audio panel at GameSoundCon. While discussing the studio's implementation of high dynamic range audio, Morasky grouped HLX alongside Deadlock, inadvertently providing the first public acknowledgement from Valve staff of the long-rumored project. [1][2]
The remark caught immediate reactions from fellow panelists, with one Valve developer whispering to Morasky that he had "only mentioned HLX once." Although Morasky subsequently attempted to deny the project exists, references to the codename have previously surfaced in Source 2 code strings across games like Dota 2, Counter-Strike 2, and Deadlock. [1][2]
Widely believed to be the next installment in the Half-Life franchise following Half-Life: Alyx, HLX is expected to depart from virtual reality exclusivity. The title reportedly underwent private playtests late last year, though public details from Valve remain unannounced as internal development continues. [1]

Sound designer lets Half Life-related codename slip at a conference.
via Ars Technica
We have known about the project codenamed ‘HLX' for years at this point, with the name appearing in numerous code strings for Source 2 games, including Dota 2, Deadlock and Counter-Strike 2. Unfortunately, this new Half Life game has not yet been publicly announced, or even acknowledged by Valve, but that changed earlier this week. … The post Valve developer confirms ‘HLX’ during panel first appeared on KitGuru.
via KitGuru