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

Difficulty: Very hard (0)

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

Difficulty: Easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Very easy (0)