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

Difficulty: Medium

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

Difficulty: Medium

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

Difficulty: Medium

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

Difficulty: Medium