The Stone Keysare artifacts that appear in Paper Mario: The Thousand-Year Door. The Moon Stone and Sunstone are items that are needed to open the way to Hooktail's Castle. Mario can learn about these artifacts from Kroop, the mayor of Petalburg when looking for the Diamond Star. Kroop would tell him that they would lie in the ruined stronghold that is east of Petalburg. The stones will be guarded by a Thwomp, Fuzzies, and a Gold Fuzzy. Once obtained, he will be able to use the stones on the stone formation in Petal Meadows to make a Warp Pipe appear so Mario can reach Hooktail's Castle.
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