Easy - Mission 11
STARDUST |

S - This is at the very bottom of the level, right in the center of the floor. |

T - This is floating just under the first platform. |

A - This is on the arch just above the first platform. |

R - This is on a small ledge just before the first ring. |

D - This is on the floor just after the first ring. |

U - This is on a ledge just before the second ring. |

S - This is just below the second ring but above the U coin. |

T - This is on the floor just after the second ring. |