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

Difficulty: Very easy (0)

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

Difficulty: Easy (0)

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

Difficulty: Easy (0)

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

Difficulty: Super easy (0)