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

Difficulty: Very hard (0)

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

Difficulty: Very easy (0)

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

Difficulty: Super easy (0)

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

Difficulty: Very easy (0)