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

Difficulty: Super easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Very easy (0)