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

Difficulty: Very hard (0)

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

Difficulty: Very easy (0)

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

Difficulty: Very hard (0)

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

Difficulty: Very easy (0)