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

Difficulty: Very easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Easy (0)

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

Difficulty: Very easy (0)