Tough Sudoku #234470 | Peak Sudoku

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This puzzle

#234470

Tough(65/100)
SE: 4
Clues: 29
Symmetry: 180° rotational

81 leftNo cell selected

1–9 writes into the selected cells.

Techniques in this puzzle4

Naked Single Hidden Single Pointing Pair Skyscraper

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Tough Sudoku #234470 | Peak Sudoku