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

Difficulty: Super easy (0)

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

Difficulty: Medium (0)

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

Difficulty: Super easy (0)

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

Difficulty: Very easy (0)