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

Difficulty: Very hard (0)

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

Difficulty: Hard (0)

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

Difficulty: Very easy (0)

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

Difficulty: Hard (0)