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

Difficulty: Very easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Easy (0)

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

Difficulty: Easy (0)