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

Difficulty: Very easy (0)

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

Difficulty: Easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Very easy (0)