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

Difficulty: Super hard (134)

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

Difficulty: Very easy (0)

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

Difficulty: Super hard (16)

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

Difficulty: Super easy (0)