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

Difficulty: Medium

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

Difficulty: Medium

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

Difficulty: Medium

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

Difficulty: Medium