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

Difficulty: Very easy (0)

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

Difficulty: Super easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Super easy (0)