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

Difficulty: Very easy (0)

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

Difficulty: Easy (0)

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

Difficulty: Hard (0)

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

Difficulty: Very easy (0)