Here's a mod that puts Halo's multiplayer into Half-Life, which to me feels like putting tea in your coffee
"What if we recreated this game in that engine?" is a classic modding conceit, up there with "What if Stalker was even more miserable?" and "What if this character had no clothes on?". In fact, I'm surprised it's taken 25 years for someone to stick Halo's multiplayer into Half-Life. It's the sort of harebrained scheme I would have eagerly read about on Planet Half-Life back in 2006...
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