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

Difficulty: Super hard (763)

	7
						4
				9	7
				1
			3	6
		7
							8

Difficulty: Super hard (98)

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

Difficulty: Easy (0)

				6
	9					4
							8
		5		8		7
	6
		6					5
				1

Difficulty: Super hard (610)