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

Difficulty: Super easy (0)

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

Difficulty: Easy (0)

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

Difficulty: Hard (0)

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

Difficulty: Very easy (0)