Yeh wtf was that??
There's your answer.I hate mountains.
It's the "I Hate Mountains" custom campaign for L4D1. It's easily one of the best custom campaigns I've seen/played. The mansion shown in the image there is almost fully explorable inside. Room after room, each detailed like an actual mansion would be.
It was made by the same guys who did Portal Prelude. It also required a rebuild of the sound cache and a few other requirements, but it was well worth it in the end.
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