Phantom Tollbooth

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Across
  1. 4. The silent, sound-hoarding character
  2. 6. The mountains of _____
  3. 10. The act of figuring things out
  4. 13. The opposite of Dictionopolis
  5. 14. Rhyme and Reason's domain
  6. 16. The Whether Man's Job
  7. 18. The Mathmagician's brother
Down
  1. 1. Milo's initial feeling about everything
  2. 2. What Milo rescues Rhyme and Reason from
  3. 3. The place where Milo gets lost
  4. 5. The land where words are sold
  5. 7. What the Humbug is full of
  6. 8. The city of numbers
  7. 9. The noisy, opinionated insect
  8. 11. The King of Dictionopolis
  9. 12. The watchdog with a clock in his side
  10. 15. Milo's method of travel
  11. 17. A state of boredom and inactively