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

Difficulty: Super easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Very easy (0)