Solution to Sudoku no 669

Sudoku no 669 (Extreme)

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Solution to Sudoku no 668

Sudoku no 668 (Tough)

This puzzle has a similar grade to the 400 in my book.

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Solution to Sudoku no 667

Sudoku no 667 (Easy)

Our younger son created this puzzle using a Javascript program which he wrote himself.

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Solution to Sudoku no 666

Sudoku no 666 (Diabolical)

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