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The Shop Key is an item in Paper Mario: The Thousand-Year Door. It is used in Chapter Four, when Mario must advance in Twilight Trail, but a fallen tree is in the way. Finding a Shop Key, Mario finds out by the shopkeeper of Twilight Town's shop and is given permission to use it his key the shop's storage room. Finding lots of items, they find a key to open a Black Chest, which gives Mario and his partners the Tube ability, allowing them to roll under the fallen tree.
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