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

Difficulty: Very easy (0)

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

Difficulty: Harder (0)

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

Difficulty: Very easy (0)

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

Difficulty: Very easy (0)