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

Difficulty: Very easy (0)

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

Difficulty: Very hard (0)

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

Difficulty: Very easy (0)

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

Difficulty: Very easy (0)