Tough Sudoku #177564 | Peak Sudoku

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This puzzle

#177564

Tough(69/100)
SE: 4
Clues: 32
Symmetry: 180° rotational

81 leftNo cell selected

1–9 writes into the selected cells.

Techniques in this puzzle5

Naked Single Hidden Single Pointing Pair Naked Pair Skyscraper

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Tough Sudoku #177564 | Peak Sudoku