Half-Life 3 would've been playtested for an insane amount of time, and the developer has even gone as far as hiring an in-house experimental psychologist specifically tasked to playtesting.

A new Half-Life 3 rumor may be disappointing for those waiting for a big resurgence for the series. In 2004, Valve unleashed something that would change gaming forever. Half-Life 2 was a game ...

I'd previously mentioned SourceWorld in my 2024 roundup of Half-Life 2's most impressive mods. Back then, it was closer to a proof-of-concept prototype. A technical feat, but unpolished.