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

Difficulty: Very easy (0)

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

Difficulty: Super easy (0)

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

Difficulty: Easy (0)

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

Difficulty: Easy (0)