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

Difficulty: Very easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Super easy (0)

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

Difficulty: Very easy (0)