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

Difficulty: Very easy (0)

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

Difficulty: Hard (0)

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

Difficulty: Very easy (0)

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

Difficulty: Very easy (0)