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

Difficulty: Easy (0)

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

Difficulty: Easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Very easy (0)