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

Difficulty: Very easy (0)

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

Difficulty: Easy (0)

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

Difficulty: Super easy (0)

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

Difficulty: Very easy (0)