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

Difficulty: Harder (0)

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

Difficulty: Very easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Very easy (0)