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

Difficulty: Very easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Easy (0)

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

Difficulty: Very easy (0)