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

Difficulty: Very easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Medium (0)