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

Difficulty: Easy (0)

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

Difficulty: Harder (0)

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

Difficulty: Very easy (0)

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

Difficulty: Very easy (0)