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

Difficulty: Easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Medium (0)

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

Difficulty: Easy (0)