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

Difficulty: Very hard (0)

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

Difficulty: Very hard (0)

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

Difficulty: Very easy (0)

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

Difficulty: Very hard (0)