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

Difficulty: Easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Very hard (0)

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

Difficulty: Super easy (0)