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

Difficulty: Very easy (0)

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

Difficulty: Very hard (0)

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

Difficulty: Very easy (0)

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

Difficulty: Very easy (0)