11		3
						10	8				4		13	5
7		3				4					11
			6		9		14					8			10
				14	4			16	13			10
			3	6		8						13	1
12	8			16	13							11		14
2		14			11		5		10			7		4
	16		11			9		5		7			15		4
	4		1							3	6			13	14
		12	5						4		10	6
			7			5	4			13	12
1			15					9		4		3
				1					12				9		13
	14	7		5				3	11
13		6

Difficulty: Very easy (0)

					11		5			16		13			15
		16				1			7
6		10	13	15	16		7						8	4
		8			13		9		11
4			12			15									8
	13										11			9	7
	15		5				4	14	13					1	6
	10							16			8				12
1				9			11							5
9	8					5	3	11				1		14
7	2			10										8
3									15			4			10
						6		10		13			7
	9	4						15		11	12	10	5		1
						16			3				12
10			11		12			7		1

Difficulty: Very easy (0)

		11			9		15		4			3
		2					11			16	13			14
		8			13									5
13			6	5					11			1	9
		7		2		16		12							8
10					5	8		11	16
	16						6	2	7	14
		12		15					13					2
	7					5					4		12
					15	4	7	5						13
						6	13		1	3					11
11							8		15		7		2
		10	13			9					3	5			7
	2									7			4
	6			8	10			1					14
			3			15		8		5			6

Difficulty: Hard (0)

	2			14		7		4		10					3
	4	10						12		11			2
							11							4	15
				4			9			7	13	8	11	1
		9			14
14				10			12	5		2	16			3
2					8	3			4		10			14
			10				1		9	14		6
			5		1	16		11				3
	6			3		13			10	9					11
	16			11	6		14	3			1				7
										5			14
	11	6	1	2	7			13			4
15	12							9
		7			11		3						5	6
10					4		6		7		15			11

Difficulty: Easy (0)