5			1					9
	7	6			8	4	5
	1	8		4	5	2
		4	8		3	5
		5	7	6		8	1
	9	1			4	7	2
6			5					1

Difficulty: Very hard (0)

	5			8	3			1
			5	7	9	4
	3					8
2	1			5			4
9	4						1	2
	7			4			3	8
		1					7
		7	1	2	4
8			7	3			9

Difficulty: Very easy (0)

	1			9	7		8
	2						4
		6			2	3
4		5		2
6			7		1			8
				5		7		6
		9	3			8
	8						6
	6		2	7			1

Difficulty: Very easy (0)

	6						1
			5	4	1
2			3		6			5
	9	8	1	2		6	3
	1						5
	2	4		5	9	1	7
7			9		4			6
			2	8	3
	8						4

Difficulty: Super easy (0)