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

Difficulty: Hard (0)

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

Difficulty: Easy (0)

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

Difficulty: Easy (0)

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

Difficulty: Very easy (0)