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

Difficulty: Very easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Easy (0)

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

Difficulty: Very easy (0)