Killer Sudoku, Difficulty 7

Puzzle 407 May 14 May 2009
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Difficulty 7/10 Average solving time 33 min
Puzzle 424 May 19 May 2009
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Difficulty 7/10 Average solving time 33 min
Puzzle 430 May 21 May 2009
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Difficulty 7/10 Average solving time 52 min
Puzzle 442 May 25 May 2009
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Difficulty 7/10 Average solving time 40 min
Puzzle 469 Jun 3 June 2009
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Difficulty 7/10 Average solving time 46 min
Puzzle 475 Jun 5 June 2009
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Difficulty 7/10 Average solving time 48 min
Puzzle 478 Jun 6 June 2009
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Difficulty 7/10 Average solving time 43 min
Puzzle 481 Jun 7 June 2009
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Difficulty 7/10 Average solving time 41 min
Puzzle 505 Jun 15 June 2009
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Difficulty 7/10 Average solving time 29 min
Puzzle 517 Jun 19 June 2009
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Difficulty 7/10 Average solving time 40 min
Daily Killer Sudoku