Tough Sudoku #172638 | Peak Sudoku

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#172638

Tough(70/100)
SE: 4.1
Clues: 28
Symmetry: 180° rotational

81 leftNo cell selected

1–9 writes into the selected cells.

Techniques in this puzzle5

Hidden Single Naked Single Pointing Pair Skyscraper 2-String Kite

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Tough Sudoku #172638 | Peak Sudoku