## Dr. Ecco: Mathematical DetectiveIn this collection of original puzzles, games, and codes, the heroic Dr. Ecco, a mathematical detective and puzzle solver, takes on his archenemy, Baskerhound, and uncovers a plot that threatens the world. No sophisticated mathematical background is necessary to solve these challenges, which were inspired by the methods and thinking of researchers in computer science and mathematics. All you need is imagination and a passion for puzzles. |

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### Contents

The Letter O | 3 |

Running Bulls I | 11 |

Humpty Dumpty at the Irish Cliffs I | 17 |

Museum Tour I | 26 |

Elves Flip Q | 36 |

JUSTIFYING TIIE MEANS | 57 |

I7 Amazon Exchange I | 73 |

I9 The Octopelago Problem I | 83 |

Epidemiologists I | 125 |

A SECRET SOCIETY | 143 |

Polling the Oddists | 149 |

The Hokkaido Post Oﬂice Problem I | 152 |

Plea from a Fugitive I | 165 |

Television Treason 0 | 180 |

SOLUTIONS T0 THE PUZZLES | 193 |

71 | 239 |

MicroAir I | 90 |

A Question of Inheritance 00 | 97 |

BAll LE FOR A OONTINENT | 109 |

Finding the Target I | 118 |

73 | 247 |

109 | 255 |