Killer Sudoku, Difficulty 7

Puzzle 646 Aug 1 August 2009
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Difficulty 7/10 Average solving time 36 min
Puzzle 648 Aug 2 August 2009
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Difficulty 7/10 Average solving time 32 min
Puzzle 652 Aug 3 August 2009
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Difficulty 7/10 Average solving time 36 min
Puzzle 658 Aug 5 August 2009
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Difficulty 7/10 Average solving time 40 min
Puzzle 662 Aug 6 August 2009
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Difficulty 7/10 Average solving time 42 min
Puzzle 680 Aug 12 August 2009
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Difficulty 7/10 Average solving time 34 min
Puzzle 707 Aug 21 August 2009
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Difficulty 7/10 Average solving time 40 min
Puzzle 719 Aug 25 August 2009
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Difficulty 7/10 Average solving time 53 min
Puzzle 728 Aug 28 August 2009
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Difficulty 7/10 Average solving time 56 min
Puzzle 743 Sep 2 September 2009
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Difficulty 7/10 Average solving time 44 min
Daily Killer Sudoku