Extreme Sudoku #460355 | Peak Sudoku

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This puzzle

#460355

Extreme(88/100)
SE: 5.6
Clues: 27
Symmetry: Anti-diagonal

81 leftNo cell selected

1–9 writes into the selected cells.

Techniques in this puzzle7

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

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Extreme Sudoku #460355 | Peak Sudoku