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

Difficulty: Medium

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

Difficulty: Medium

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

Difficulty: Medium

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

Difficulty: Medium