94. Mind Marathon

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Across
  1. 1. Base argument
  2. 5. Complex maze
  3. 7. Deep puzzle
  4. 9. Confusing twist
  5. 10. Hard dilemma
  6. 12. Hidden code
  7. 13. Brain test
Down
  1. 2. Full range
  2. 3. Structural plan
  3. 4. Problem method
  4. 6. Proposed idea
  5. 8. Number grid
  6. 11. Key link