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

Difficulty: Super hard (42)

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

Difficulty: Very hard (0)

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

Difficulty: Super easy (0)

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

Difficulty: Medium (0)