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

Difficulty: Medium

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

Difficulty: Medium

9				3			6	10
		7		4
			2				10	8
		7					8
9				6
			1				5
						5	3
	4	1
			2

Difficulty: Medium

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

Difficulty: Medium