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

Difficulty: Easy (0)

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

Difficulty: Hard (0)

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

Difficulty: Very easy (0)

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

Difficulty: Easy (0)