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

Difficulty: Super easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Super easy (0)

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

Difficulty: Very hard (0)