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

Difficulty: Very easy (0)

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

Difficulty: Harder (0)

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

Difficulty: Very easy (0)

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

Difficulty: Easy (0)