8
		9	1
9	5							2	4
7				6			10
6				8	2				7
1				9	6				3
		2			5				8
3	9							7	2
						5	1
							7

Difficulty: Very easy (0)

	6				4			5
9	4				10
8				1		7
4									5
	8		9	3		10
			10		6	9		8
10									1
			7		9				4
				6				1	8
	9			8				6

Difficulty: Easy (0)

	7	8				1		5
		2			10				4
	2						5
				5			8
10		1
							1		9
		4			5
		3						4
8				4			6
	6		7				9	1

Difficulty: Very easy (0)

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

Difficulty: Very easy (0)