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

Difficulty: Super easy (0)

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

Difficulty: Easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Super easy (0)