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

Difficulty: Very easy (0)

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

Difficulty: Hard (0)

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

Difficulty: Very easy (0)

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

Difficulty: Very easy (0)