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The Fourside Sewers is an area in EarthBound that, as the name implies, is a sewer network below Fourside. It is home to many new enemies, such as the Filthy Attack Roach, the Deadly Mouse, and the Stinky Ghost. It also leads to Magnet Hill, which is the fifth Your Sanctuary location. However, the path is guarded by the Plague Rat of Doom.