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

Difficulty: Very easy (0)

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

Difficulty: Super easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Very easy (0)