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

Difficulty: Very easy (0)

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

Difficulty: Super easy (0)

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

Difficulty: Hard (0)

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

Difficulty: Easy (0)