8	1			4	2
6		1	2	8			4	9
3		2	7		1
			8	9			6
		5	6		9	2
	1			2	8
			4		3	1		2
8	9			4	2	3		6
	4	6			7	8

Difficulty: Very easy (0)

6		4					7
						8	2	5
	7			6	2	3	5
				3	4	6		9
	8		9		1		4
2		8	6	7
	9	1	4	5			8
4	1	7
	4					9		2

Difficulty: Very easy (0)

					1	9		8
4	9				3
	8	6		3	7
5		8		2		4	6
3			7	8	6			2
	5	3		4		2		6
			4	1		6	8
			1				9	5
8		1	6

Difficulty: Very easy (0)

	7				4	8		6
	6		4	9
			6	4	7			5
		4	9			2		8
5		8				6		3
3		7			9	1
1			7	3	8
				6	3		2
6		3	8				5

Difficulty: Medium (0)