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

Difficulty: Easy (0)

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

Difficulty: Easy (0)

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

Difficulty: Easy (0)

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

Difficulty: Very easy (0)