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

Difficulty: Very easy (0)

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

Difficulty: Super easy (0)

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

Difficulty: Medium (0)

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

Difficulty: Very easy (0)