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

Difficulty: Very easy (0)

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

Difficulty: Super easy (0)

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

Difficulty: Easy (0)

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

Difficulty: Very easy (0)