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

Difficulty: Super easy (0)

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

Difficulty: Easy (0)

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

Difficulty: Easy (0)

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

Difficulty: Very easy (0)