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

Difficulty: Easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Easy (0)