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

Difficulty: Super easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Super easy (0)