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)

		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)

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

Difficulty: Easy (0)

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

Difficulty: Very easy (0)