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

Difficulty: Medium

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

Difficulty: Medium

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

Difficulty: Medium

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

Difficulty: Medium