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

Difficulty: Easy (0)

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

Difficulty: Very hard (0)

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

Difficulty: Very easy (0)

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

Difficulty: Very hard (0)