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

Difficulty: Very easy (0)

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

Difficulty: Super easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Very easy (0)