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

Difficulty: Very easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Hard (0)