Extreme Sudoku #21601 | Peak Sudoku

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This puzzle

#21601

Extreme(87/100)
SE: 5.6
Clues: 25
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 Naked Pair XY-Chain

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Extreme Sudoku #21601 | Peak Sudoku