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

Difficulty: Easy (0)

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

Difficulty: Very easy (0)

	8
	4
		6						1
	7						6
5						8
							3
							1

Difficulty: Super hard (272)

	6
						5
						6
								3
7
		9
		2
							4

Difficulty: Very hard (0)