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

Difficulty: Easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Super easy (0)

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

Difficulty: Easy (0)