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

Difficulty: Very easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Super easy (0)

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

Difficulty: Very easy (0)