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

Difficulty: Super easy (0)

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

Difficulty: Super easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Very easy (0)