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

Difficulty: Harder (0)

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

Difficulty: Easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Easy (0)