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

Difficulty: Very easy (0)

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

Difficulty: Easy (0)

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

Difficulty: Easy (0)

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

Difficulty: Medium (0)