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

Difficulty: Very easy (0)

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

Difficulty: Super easy (0)

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

Difficulty: Super easy (0)

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

Difficulty: Super easy (0)