From the Super Mario Wiki
Star Pieces are collectible items in the Paper Mario series. They are found in hidden locations throughout the games, and some are even found underground, in which case a Spin Jump or Mario's Ultra Hammer is used to collect them. Star Pieces can be used to trade for various badges. There are 160 in Paper Mario and 100 in Paper Mario: The Thousand-Year Door. In Paper Mario, they are used for trading with Merlow for badges. 64 of the 160 pieces in this game are held by Chuck Quizmo. In Paper Mario: The Thousand-Year Door, they are used for trading with Dazzle in Rogueport Sewers. The fortune teller Merluvlee can tell Mario where the star pieces are.
Star Pieces make a cameo appearance in the minigame Frozen Frenzy in Mario Party 5. The player who collects the most wins the minigame.
Names in other languages
Hoshi no Kakera
- Star Pieces resemble Revives from the Pokémon series. There is also a valuable item called Star Piece.