City Firefly

**Sudoku, Skyscrapers, Zipper Lines** - Standard sudoku rules apply: The digits 1 through 9 appear in every row, column, and box. - Skyscrapers: Each cell represents a ‘skyscraper’ whose height is the digit in that cell. Taller skyscrapers obscure the view of smaller ones. Clues outside the grid tell how many skyscrapers are visible looking across the row or column from the direction of the clue. - Zipper Line: Along Zipper lines, pairs of digits equidistant from the center of the line have the same sum. For Zipper lines of odd length, that sum is the central digit on the line. Subscribe to our mailing list to receive a weekly email with all of our puzzles from the past week: https://missingdeck.net/mailing.html