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Solution to Sudoku no 669

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Sudoku no 669 (Extreme)

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Solution to Sudoku no 668

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Sudoku no 668 (Tough)

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This puzzle has a similar grade to the 400 in my book. Buy my book Solve online Sudoku grader and solver See answer

Solution to Sudoku no 667

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Sudoku no 667 (Easy)

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Our younger son created this puzzle using a Javascript program which he wrote himself. Solve online Sudoku grader and solver See answer

Solution to Sudoku no 666

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