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

Difficulty: Super easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Hard (0)

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

Difficulty: Easy (0)