7			9						3
						6	10
				4			2	11	1		10
			1		10	4		6	5	3
	3					7					8
			6	2					12	8	9
2	6	12					3	10
6					7					4
	5	10	11		8	2		12
4		7	12	10			9
				11	1
		4						2			12

Difficulty: Very easy (0)

			6					9	7		2
2	4	10			3	8			1
							6	4		10
7		6						3
								2		1
12						10		5			11
6			3		7						10
	8		10
			12						2		7
	5		11	9
		4			6	11			8	9	5
8		9	2					7

Difficulty: Hard (0)

			12		7					8
			4	5	3		9			10
		4		8		10
						7		1	4	3	8
	7				8	11			10	6
									1	2
	1	3
	11	10			12	8				5
9	4	6	1		2
					11		8		6
	2			12		9	4	7
	10					6		8

Difficulty: Easy (0)

							9				6
			10	5		7
	12	11	2	3			5	8	10		7
9	1	7			5	8			11
			3	9					12
2					1	6	11
				4	2	12					11
		10					4	7
		4			7	3			6	10	9
11		9	4	7			8	3	1	2
					8		2	6
8				2

Difficulty: Super easy (0)