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

Difficulty: Very easy (0)

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

Difficulty: Easy (0)

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

Difficulty: Medium (0)

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

Difficulty: Hard (0)