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

Difficulty: Super easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: 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)