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

Difficulty: Easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Hard (0)

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

Difficulty: Easy (0)