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

Difficulty: Easy (0)

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

Difficulty: Medium (0)

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

Difficulty: Super easy (0)

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

Difficulty: Easy (0)