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

Difficulty: Very easy (0)

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

Difficulty: Hard (0)

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

Difficulty: Very easy (0)

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

Difficulty: Easy (0)