Which Sudoku is the hardest?

Which Sudoku is the hardest? Expert level Sudoku This hardest Sudoku puzzle is characterized by the fact that only a few numbers are shown in the Sudoku square, which consists of 9 small squares, where the cells are located 3×3.

Expert level Sudoku

This hardest Sudoku puzzle is characterized by the fact that only a few numbers are shown in the Sudoku square, which consists of 9 small squares, where the cells are located 3×3.

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