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

Difficulty: Very easy (0)

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

Difficulty: Super easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Super easy (0)