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

Difficulty: Very easy (0)

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

Difficulty: Easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Super easy (0)