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

Difficulty: Hard (0)

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

Difficulty: Medium (0)

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

Difficulty: Super easy (0)

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

Difficulty: Very easy (0)