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Theme: Clue Symmetry and Logic
Author/Opus: This is the 99th puzzle from our contributing puzzlemaster Prasanna Seshadri.
Rules: Standard Tapa rules. Also, numbers outside the grid show the number of separate wall segments visible in that direction. A segment of length N in a given direction is taken as a building of height N. Buildings of height N block the view of all buildings behind them of equal or lesser height.
See also this example (by Serkan Yürekli):
Answer String: Enter the length in cells of each of the shaded segments from left to right for the marked rows, starting at the top. Separate each row’s entry from the next with a comma.
Time Standards (highlight to view): Grandmaster = 7:30, Master = 10:00, Expert = 20:00