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

Difficulty: Easy (0)

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

Difficulty: Easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Very easy (0)