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

Difficulty: Easy (0)

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

Difficulty: Easy (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)

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

Difficulty: Hard (0)