Tough Sudoku #353977 | Peak Sudoku

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This puzzle

#353977

Tough(70/100)
SE: 4.1
Clues: 27
Symmetry: 180° rotational

81 leftNo cell selected

1–9 writes into the selected cells.

Techniques in this puzzle4

Hidden Single Naked Single Claiming 2-String Kite

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Tough Sudoku #353977 | Peak Sudoku