Tough Sudoku #12109 | Peak Sudoku

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#12109

Tough(68/100)
SE: 4
Clues: 28
Symmetry: Anti-diagonal

81 leftNo cell selected

1–9 writes into the selected cells.

Techniques in this puzzle6

Hidden Single Naked Single Pointing Pair Naked Quad Claiming Naked Triple

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Tough Sudoku #12109 | Peak Sudoku