Fortress Key
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It has been requested that this article be rewritten and expanded to include more information.
Fortress Keys are used to open doors in the Koopa Bros. Fortress in Paper Mario. There's four throughout the area, and each need to be used to progress. The Koopa Bros. hid some keys behind bars, and left some to be guarded by enemies.
The keys can only be used in the Koopa Bros. Fortress.
