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

Difficulty: Easy (0)

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

Difficulty: Easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Easy (0)