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

Difficulty: Medium (0)

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

Difficulty: Super easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Super easy (0)