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

Difficulty: Medium

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

Difficulty: Medium

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

Difficulty: Medium

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

Difficulty: Medium