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

Difficulty: Easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Medium (0)