7	4
	5	2					6
						3
					1
		2						3
				7
			1				4
6	5

Difficulty: Medium

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

Difficulty: Medium

			3			5
	2		6
			1			1
						4
	6
					5
		2
						4	3

Difficulty: Very Hard

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

Difficulty: Medium