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

Difficulty: Very easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Super easy (0)