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

Difficulty: Easy (0)

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

Difficulty: Easy (0)

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

Difficulty: Hard (0)

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

Difficulty: Very easy (0)