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

Difficulty: Super easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Harder (0)

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

Difficulty: Very easy (0)