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

Difficulty: Medium

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

Difficulty: Medium

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

Difficulty: Medium

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

Difficulty: Medium