From the Super Mario Wiki
Retrieved from "https://www.mariowiki.com/index.php?title=Fortress_Key&oldid=2207450"
Fortress Keys are items found in Paper Mario. They are only used to open doors in the Koopa Bros. Fortress. Four are scattered throughout the area and are needed to progress. The Koopa Bros. hid some of the keys behind bars and left others to be guarded by enemies.
Names in other languages