diabolical sudoku techniques

3:43

4:03

1:30

1:16

3:39

1:49

49:04

1:07

1:55

2:55

5:31

9:25

9:11

3:47

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1:28

2:14

30:28

25:31

1:03

3:34

6:50

23:18

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12:55

5:17

6:47

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28:35

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45:06

کوتاه

1:18

30:12