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

Difficulty: Easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Very easy (0)