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

Difficulty: Easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Easy (0)