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

Difficulty: Very easy (0)

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

Difficulty: Super easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Very easy (0)