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

Difficulty: Super hard (70)

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

Difficulty: Very easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Very easy (0)