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

Difficulty: Hard (0)

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

Difficulty: Easy (0)

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

Difficulty: Easy (0)

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

Difficulty: Easy (0)