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

Difficulty: Easy (0)

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

Difficulty: Very hard (0)

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

Difficulty: Very hard (0)

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

Difficulty: Easy (0)