Holy crossword

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Across
  1. 3. A game or problem designed to test knowledge or skill.
  2. 7. A puzzle involving filling a grid with words based on clues.
  3. 8. Words placed horizontally in a crossword grid.
  4. 10. The central topic that links all words in a crossword.
Down
  1. 1. A hint or piece of information to solve a puzzle.
  2. 2. Squares in the grid left blank or filled to separate words.
  3. 4. The structure of squares to fill in a crossword.
  4. 5. A single unit of language used in the puzzle.
  5. 6. Words placed vertically in a crossword grid.
  6. 9. To find the answer to a crossword clue.