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

Difficulty: Very easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Super easy (0)

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

Difficulty: Very easy (0)