Put a white or black dot in some of the squares below so that every black dot is adjacent (horizontally, vertically, and diagonally) to exactly 3 white dots, and each white dot is adjacent to exactly 2 black dots. Only one dot is allowed per square, and no dot is allowed in a square marked with an X.

1. | 2. | 3. | 4. | 5. |

6. | 7. | 8. | 9. | 10. |

11. | 12. | 13. | 14. |

15. | 16. | 17. | 18. |

The answers are here.