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

Difficulty: Very hard (0)

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

Difficulty: Super hard (511)

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

Difficulty: Very hard (0)

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

Difficulty: Very hard (0)