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

Difficulty: Very easy (0)

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

Difficulty: Easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Hard (0)