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+---- Thread: Mario and Luigi in Hitman (/thread-3112.html)
Mario and Luigi in Hitman - Psychospacecow - 05-02-2016
In the map Sapienza, you can find two men dressed in outfits marked as "Green Plumber" and "Red Plumber". Seeing as this map is set in Italy, this appears to be a reference to the Mario Brothers, Mario and Luigi.