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

Difficulty: Very easy (0)

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

Difficulty: Easy (0)

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

Difficulty: Hard (0)

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

Difficulty: Super easy (0)