8	12	10		9	7				11			2
	14	11	2	6				3	8					15
				7	5								9
		9				2			14	3	15			7
11		5			4		10	12				2	8
			8	1					9	12			10
		1			14				6	7	9			8
			13	12						1	10
14			3	11	7				2			6
	11			8	3					4	12
	10	7				9	1		11			15		13
13			15	14	12			10				7
	4								15	8
8					2	3				15	1	4	12
	15			13				4	12		2	10	7

Difficulty: Hard (0)

			13				12	6			8
12	6	3		11			8					15	5
10			9					2		4			11
	3		1			14			7		10	2
6		4					9			11	3	13	1
		15	5				4		11
	1	13			15		10	11					2
	4			12			7			10			14
	14					4	1		13			8	9
					13		5				14	6
	11	9	6	4			15					7		5
		14	8		9			3			11		13
	8			7		3					2			13
	9	11					13			1		10	4	6
			10			7	11				15

Difficulty: Very easy (0)

			12			2	3			14				9
		14			7		10	4			3	6	15
5			9		1	11			12	10		4
9	4			5	13	1					10		14	2
		2		10		5		12
			1	6	4						8		5
	10	13			12			6			1			5
	8					15		3					4
3			4			8			1			10	7
	14		3						11	5	4
						13		8		15		14
10	5		13					2	3	11			6	12
		4		9	5			1	15		14			3
	7	5	15			12	11		4			8
12				11			6	13			7

Difficulty: Very easy (0)

	10				5	14				1	15			13
14			8	4			12		10
		9			8	11			3	10	2	4
	7	12			13	8	4	3				15	1
	8	14	6		10			2			9	13
9			3	15								11		4
	6	8			9				12		13
	9			13		2		15		3			8
			11		7				13			2	4
15		11								6	3			14
		6	14			3			1		7	10	2
	3	10				6	13	14	5			9	15
		13	15	9	2			11	4			5
					3		5			13	12			15
8			1	5				12	6				9

Difficulty: Easy (0)