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

Difficulty: Super easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Very easy (0)