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Sector 6 (NOC) Dark Area (セクター6（NOC）暗闇エリア) is the theme of the Sector 6 area in Metroid Fusion. This theme gives off an atmosphere appropriate for the nocturnal-themed area, with a "stealth" touch. This owes to the fact that, on Samus's first visit to this sector, she is required to avoid the Blue X, which can exploit her new vulnerability to cold, until she can obtain the Varia Suit.
It can be heard here: .