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

Difficulty: Easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Very easy (0)