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

Difficulty: Very easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Very easy (0)