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

Difficulty: Very hard (0)

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

Difficulty: Medium (0)

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

Difficulty: Easy (0)

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

Difficulty: Very easy (0)