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

Difficulty: Very easy (0)

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

Difficulty: Super easy (0)

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

Difficulty: Super easy (0)

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

Difficulty: Easy (0)