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

Difficulty: Very hard (0)

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

Difficulty: Very easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Very easy (0)