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

Difficulty: Very easy (0)

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

Difficulty: Super easy (0)

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

Difficulty: Easy (0)

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

Difficulty: Very easy (0)