Sharp Crossword

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Across
  1. 5. A call to participate in a competitive situation.
  2. 8. A piece of evidence or information used to solve a problem.
  3. 9. The organ for thought and intelligence.
  4. 10. The witty exploitation of words.
Down
  1. 1. The quality of being clever and inventive.
  2. 2. A game, toy, or problem designed to test ingenuity.
  3. 3. A person who finds a solution to a puzzle.
  4. 4. Reasoning according to strict principles.
  5. 6. A response to a question or problem.
  6. 7. A framework of lines that cross each other.