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

Difficulty: Very easy (0)

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

Difficulty: Very hard (0)

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

Difficulty: Easy (0)

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

Difficulty: Medium (0)