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

Difficulty: Very easy (0)

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

Difficulty: Easy (0)

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

Difficulty: Medium (0)

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

Difficulty: Very easy (0)