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

Difficulty: Easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Easy (0)

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

Difficulty: Very easy (0)