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

Difficulty: Very easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Super easy (0)

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

Difficulty: Very easy (0)