2		6
	1				4			5
		9				3
			3	5			8	1
2	5			4	7
		4				1
3			4				5
				3		7

Difficulty: Very easy (0)

2	9	6						1
		3
	8	1	6
							3	5
	4						2
5	6
					3	6	1
						7
8						3	5	2

Difficulty: Very easy (0)

	4			9	5
	9		1		6	4
	7							9
2				1
				6				8
4							7
		1	7		4		6
			8	5			4

Difficulty: Very easy (0)

7			1			3
		9		4
	2	6
	6	1
4		2				1		8
						6	3
						4	7
				6		9
		5			9			3

Difficulty: Very easy (0)