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

Difficulty: Easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Hard (0)

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

Difficulty: Very hard (0)