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

Difficulty: Very easy (0)

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

Difficulty: Hard (0)

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

Difficulty: Hard (0)

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

Difficulty: Super easy (0)