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CONTAINS SPOILERS
Routes to the top walls in The Overgrown Ruins
Jefferson's clue: "There are still some old routes up to the top walls, you just need a way to cross the moat..." Before you enter The Overgrown Ruins, there is a Hook Shot pole you can access to the left by the moat. Get across and then fire an arrow at the glowing red switch to activate the floor. Use your Hook Shot spell to cross the left and face a wave enemies leading to the top walls.