Extreme Sudoku #21711 | Peak Sudoku

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This puzzle

#21711

Extreme(83/100)
SE: 5.5
Clues: 25
Symmetry: 180° rotational

81 leftNo cell selected

1–9 writes into the selected cells.

Techniques in this puzzle8

Hidden Single Naked Single Pointing Triple Naked Triple Pointing Pair XYZ-Wing Naked Pair W-Wing

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Extreme Sudoku #21711 | Peak Sudoku