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

Difficulty: Very hard (0)

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

Difficulty: Medium (0)

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

Difficulty: Easy (0)

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

Difficulty: Easy (0)