Extreme Sudoku #463573 | Peak Sudoku

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This puzzle

#463573

Extreme(88/100)
SE: 5.7
Clues: 28
Symmetry: 180° rotational

81 leftNo cell selected

1–9 writes into the selected cells.

Techniques in this puzzle6

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

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Extreme Sudoku #463573 | Peak Sudoku