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

Difficulty: Super easy (0)

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

Difficulty: Hard (0)

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

Difficulty: Super easy (0)

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

Difficulty: Easy (0)