Brain Teasing Crosswords

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Across
  1. 3. A task requiring effort or skill to complete.
  2. 6. Secret underground chamber.
  3. 8. Complex network of passages; a maze.
  4. 9. A hint or piece of information to solve something.
  5. 10. A short test of knowledge.
  6. 11. A puzzle or mystery to solve.
  7. 13. Something unknown or hard to explain.
  8. 15. The solution to a question or problem.
  9. 18. Letters arranged to convey meaning.
  10. 19. To mix up or jumble letters or objects.
  11. 20. An answer or solution to a code.
Down
  1. 1. A system of symbols for communication.
  2. 2. Logical organ used for thinking.
  3. 3. A secret or disguised way of writing.
  4. 4. The arrangement of squares in a crossword.
  5. 5. Mythical creature known for riddles.
  6. 7. Something that confuses or challenges the mind.
  7. 8. A single character of an alphabet.
  8. 12. A word or phrase formed by rearranging letters.
  9. 14. The study of valid reasoning.
  10. 16. To form a word by letters.
  11. 17. A tricky question requiring thought to answer.