Tetris Words

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Across
  1. 2. A one-unit square on the playing field
  2. 6. An empty cell in a buried line (2 words)
  3. 8. Dropping the active piece down a little faster (2 words)
  4. 9. Number of standard Tetris pieces
  5. 10. The turn of a piece
  6. 12. Clearing four lines at once
  7. 13. A light marker in the playing field showing where the piece will land
  8. 15. A piece that is currently in play (2 words)
Down
  1. 1. Leaving no piece behind on the playing field (2 words)
  2. 3. Downward movement of a piece
  3. 4. Seeing which piece is up next
  4. 5. Instantly dropping a piece into place (2 words)
  5. 7. Reaching the top of the playing field (2 words)
  6. 11. Technical term for each Tetris game piece
  7. 14. Proceeding to the next level (2 words)