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

Difficulty: Hard (0)

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

Difficulty: Very easy (0)

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

Difficulty: Super easy (0)

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

Difficulty: Easy (0)