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

Difficulty: Very easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Very hard (0)

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

Difficulty: Very easy (0)