Crossword stairs

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Across
  1. 4. Playfully causing trouble
  2. 5. The thing you are doing right now
  3. 7. A class of arthropods
  4. 8. BIS is an international _______.
Down
  1. 1. A board game also known as draughts
  2. 2. The shade of purple which is also a flower
  3. 3. ________: Impossible (film name)
  4. 6. Americans eat this for breakfast with eggs