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

Difficulty: Hard (0)

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

Difficulty: Super easy (0)

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

Difficulty: Easy (0)

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

Difficulty: Super easy (0)