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

Difficulty: Very easy (0)

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

Difficulty: Hard (0)

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

Difficulty: Very easy (0)

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

Difficulty: Very easy (0)