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

Difficulty: Very easy (0)

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

Difficulty: Easy (0)

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

Difficulty: Super easy (0)

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

Difficulty: Very easy (0)