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

Difficulty: Hard (0)

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

Difficulty: Very easy (0)

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

Difficulty: Easy (0)

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

Difficulty: Very easy (0)