7
	4
6					4
8	9				2	1
				8
		5	9				3	8
			5					3
							2
					9

Difficulty: Very hard (0)

	6							7
					2	3
1			9			4
	5			6
7				1
							7	8
	4
		5
				5

Difficulty: Very easy (0)

1			7	3		6
								5
	3	4		5		9
			6
6				9				2
					8
		2		8		1	9
4
		7		6	3			4

Difficulty: Very easy (0)

		6			4
1			7					6
2		5				3		8
4					1			9
			3			8

Difficulty: Very hard (0)