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

Difficulty: Very easy (0)

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

Difficulty: Super easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Very hard (0)