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

Difficulty: Super easy (0)

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

Difficulty: Hard (0)

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

Difficulty: Easy (0)

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

Difficulty: Very easy (0)