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

Difficulty: Easy (0)

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

Difficulty: Easy (0)

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

Difficulty: Super easy (0)

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

Difficulty: Very easy (0)