OnlySudoku

Step by step example of solving a level 5 (very hard) sudoku puzzle

Step 30

Let’s look at row I. The logic of this sudoku solution is very similar to the one in step 28. There are two blank cells (IK & IL). The number 4 must be in one of them. We can’t put 4 in cell IK for there’s a 4 in cell BK on the same column. Hence, the number 4 must be in cell IL.

1		7
5	4
9		6

3	4
6	2
8	7


		7
		4

4		1
3		2
8

2	6	8
9	5	4
7	1	3

3		5
		8
4	2

2	1	8
6
7		Step30: 4

4	9	7
5	8	2
1	3	6

5	6	3
7	4	1
9	8	2

Choose the Step

1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18
19	20	21	22	23	24	25	26	27	28	29	30	31	32	33	34	35	36
37	38	39	40	41	42	43	44	45	46	47	48	49	50	51	52	53	54

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