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

Difficulty: Harder (0)

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

Difficulty: Very easy (0)

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

Difficulty: Easy (0)

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

Difficulty: Very easy (0)