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Intermediate puzzles: Once comfortable with beginner puzzles, move on to intermediate puzzles to keep the brain engaged. hardest sudoku puzzles In conclusion, solving difficult Sudoku puzzles requires patience, practice, and the right strategies. sudoku average timefree evil sudoku If two of these cells can only contain two numbers, and those two numbers are in different rows and columns, then those numbers must be placed in the remaining two cells of the rectangle.
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