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Visibility depends on the sequence of values in a row or column, so changing the order can completely change what is seen.
No. The normal Sudoku rules still apply. Visibility clues simply add another source of information.
Skyscraper Sudoku adds outside visibility clues, so the order of numbers in a row or column matters as much as the digits themselves.
Yes. Standard row, column and box logic still applies, but you also need to think about visibility and ordering.
Start with rows and columns that have extreme visibility clues, since they often provide the strongest opening deductions.