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A Black Key is a key that can unlock the Black Chests in Paper Mario: The Thousand-Year Door.
Locations[]
Rogueport Sewers[]
On a platform next to the paper airplane stand.
Hooktail Castle[]
In a room full of spikes that pop up and give you 50 seconds to escape the falling ceiling.
Twilight Town[]
In a shack outside the town.
Keelhaul Key[]
Held by an Ember in the room with the chest.