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

Difficulty: Very hard (0)

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

Difficulty: Very hard (0)

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

Difficulty: Easy (0)

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

Difficulty: Easy (0)