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

Difficulty: Easy (0)

	2
	9	1
				4
	3			2			8
				7
						5	7
							1

Difficulty: Easy (0)

			7
		9			5		4
		5				3
	2		4			9
					6

Difficulty: Very hard (0)

7
				4		3
1
								7
		9		2
								8

Difficulty: Very hard (0)