Shuriken

The Shruiken is a special item in Paper Mario: The Origami King. It is found in Shogun Studios, and is given by a Ninji after Mario gives him the Straw. Despite its name, the Shuriken appears to be a ring of multiple shurikens. It can be given to the owner of the Shuriken Dojo to open the place and allow Mario to play its minigame, earning the Baseball if he succeeds.