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

Difficulty: Very easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Easy (0)