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

Difficulty: Medium

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

Difficulty: Medium

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

Difficulty: Medium

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

Difficulty: Medium