A Valve developer may have just confirmed that the long-rumored Half-Life 3 project is still alive and kicking. During a recent GameSoundCon Q&A, Valve’s music designer Mike Morasky let slip a mention of “HLX”—a codename long associated with the elusive threequel—while discussing audio technology.

While Valve has remained tight-lipped, the accidental mention of “HLX” during a technical breakdown suggests the project is actively in development. Though fans are already theorizing about a potential reveal, no official release date or announcement from Valve has been confirmed.