Diabolical Sudoku #19822 | Peak Sudoku

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#19822

Diabolical(98/100)
SE: 7.2
Clues: 25
Symmetry: 180° rotational

81 leftNo cell selected

1–9 writes into the selected cells.

Techniques in this puzzle8

Naked Single Hidden Single Pointing Pair Claiming ALS Chain Naked Triple Pointing Triple XY-Chain

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Diabolical Sudoku #19822 | Peak Sudoku