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

Difficulty: Very hard (0)

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

Difficulty: Very easy (0)

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

Difficulty: Very hard (0)

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

Difficulty: Easy (0)