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

Difficulty: Very easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Hard (0)

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

Difficulty: Very easy (0)