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

Difficulty: Easy (0)

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

Difficulty: Super easy (0)

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

Difficulty: Super easy (0)

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

Difficulty: Very easy (0)