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

Difficulty: Very easy (0)

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

Difficulty: Super easy (0)

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

Difficulty: Super easy (0)

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

Difficulty: Easy (0)