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

Difficulty: Very easy (0)

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

Difficulty: Super easy (0)

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

Difficulty: Easy (0)

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

Difficulty: Super easy (0)