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

Difficulty: Super easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Very easy (0)