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

Difficulty: Very easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Super easy (0)

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

Difficulty: Very easy (0)