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  def compact_pieces
    recheck = false
    for i in (0..@width-1)
      for j in (0..@height-1)
        if @board[i][j] and @board[i][j+1].nil? #drop pieces down
          recheck = true
          @board[i][j+1] = @board[i][j]
          @board[i][j] = nil
        elsif j == 0 and @board[i][j].nil? #replace pieces at top
          recheck = true
          @board[i][j] = Piece.new("gem")
        end
      end
    end
    #sleep(0.3) <- doesn't work, all pauses come at once
    #draw
    if recheck
      compact_pieces
      clear_matches
    end
  end