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

Difficulty: Very easy (0)

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

Difficulty: Easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Super easy (0)