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

Difficulty: Easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Harder (0)

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

Difficulty: Hard (0)