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

Difficulty: Hard (0)

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

Difficulty: Very easy (0)

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

Difficulty: Super easy (0)

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

Difficulty: Super easy (0)