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

Difficulty: Medium (0)

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

Difficulty: Very easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Super easy (0)