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

Difficulty: Hard (0)

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

Difficulty: Very easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Easy (0)