Tough Sudoku #156139 | Peak Sudoku

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81 leftNo cell selected

Puzzle: #156139
Difficulty: Tough(69/100)SE 4
Clues: 28
Symmetry: Vertical mirror

1–9 writes into the selected cells.

Techniques in this puzzle4

Naked Single×13 Hidden Single×5 Pointing Pair×1 Skyscraper×1

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Tough Sudoku #156139 | Peak Sudoku