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

Difficulty: Super easy (0)

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

Difficulty: Very hard (0)

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

Difficulty: Easy (0)

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

Difficulty: Super easy (0)