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

Difficulty: Very easy (0)

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

Difficulty: Hard (0)

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

Difficulty: Easy (0)

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

Difficulty: Easy (0)