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

Difficulty: Very easy (0)

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

Difficulty: Super easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Very easy (0)