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

Difficulty: Easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Easy (0)