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

Difficulty: Hard (0)

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

Difficulty: Easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Very easy (0)