or solve online (using our beta test of Penpa-Edit tools)
Theme: Either/or — a hard solving theme despite so many clues.
Answer String: Enter the 3rd row from left to right, followed by a comma, followed by the 4th column from top to bottom.
Time Standard: Skyscrapers Grandmaster = 3:00, Master = 5:30, Expert = 11:00
Note: Advice on solving this puzzle, and also constructing Skyscraper puzzles, has now been posted in “Ask Dr. Sudoku #6”