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

Difficulty: Very easy (0)

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

Difficulty: Super easy (0)

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

Difficulty: Easy (0)

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

Difficulty: Very easy (0)