2		9	6		5	7	8	10
6		10						1			3
		3	5			4			12
					10	11	2	9
4	8			9		7
		5					12
				12					2
					6		11			3	9
			10	2	7	9
		1			11			3	8
11			6						5		4
		4	7	8	2		1	6		12

Difficulty: Hard (0)

		5		7				2
2	8		6
	10				11	8					12
1	7			4	5			6			10
					7		9	3	1	12
	6			12		3		11		5
	3		7		8		12			1
	1	2	10	3		7
8			12			10	2			6	3
9					3	5				8
								5		9	11
			8				1		2

Difficulty: Very easy (0)

10				8							1
	5						1			10
7					4	10		5	6
12							4		8	2
		11	8		3		7	10
4	10		7			8	11	9			6
6			10	9	8			1		5	7
			12	7		1		2	10
	7	9		11							3
		5	1		6	7					10
	8			2						12
9							3				4

Difficulty: Hard (0)

7	9	5	1				6			2
	3						10	6	7
		11							4
					11			7	10	9
12				7	10			4	6		1
6			9		4		12				2
5				2		7		10			9
4		3	2			10	9				8
	12	9	10			5
		2							5
		1	7	5						10
	5			3				11	2	8	7

Difficulty: Easy (0)