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

Difficulty: Very easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Medium (0)

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

Difficulty: Easy (0)