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

Difficulty: Easy (0)

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

Difficulty: Very hard (0)

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

Difficulty: Very easy (0)

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

Difficulty: Very hard (0)