It's not like the Half-Life 3 rumour mill ever went away, but over the past few years the tinfoil hats have been a-twitching more than ever. If it's not one thing, it's another: the anniversary of Half-Life 2, the latest mention of "HLX" (speculated to be an internal codename) in the Steam backend or, my personal favourite, a spike in pizza deliveries near Valve's offices...
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