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

Difficulty: Medium

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

Difficulty: Medium

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

Difficulty: Very Hard

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

Difficulty: Easy