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

Difficulty: Easy (0)

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

Difficulty: Easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Hard (0)