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

Difficulty: Very hard (0)

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

Difficulty: Very easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Very hard (0)