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

Difficulty: Very easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Hard (0)

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

Difficulty: Easy (0)