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

Difficulty: Very hard (0)

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

Difficulty: Very easy (0)

	4		3		7
1				2		8
					5
	7	5		1	4
		1	4		8	5
		2
	3		2				7
		4		8		3

Difficulty: Very easy (0)

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

Difficulty: Very easy (0)