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

Difficulty: Very easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Super easy (0)

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

Difficulty: Very easy (0)