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

Difficulty: Very easy (0)

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

Difficulty: Hard (0)

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

Difficulty: Easy (0)

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

Difficulty: Very easy (0)