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

Difficulty: Hard (0)

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

Difficulty: Hard (0)

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

Difficulty: Super easy (0)

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

Difficulty: Very easy (0)