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

Difficulty: Hard (0)

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

Difficulty: Very easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Very easy (0)