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I hope valve will officially make it can
As Quake fan I gladly declare: It's one of best campaign for quake ever I played!
Level design fully justifies the genre of the game: dynamic FPS with elements of horror (In my opinion).
About difficulty: (I played on nightmare skill and shotgun start every level) It was very hard to beat, but I was only glad.
Maybe It's the best mod ever for Quake!