9
		9	5		1
								6
8
								3
2
			2		9	5
								5

Difficulty: Very hard (0)

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

Difficulty: Very hard (0)

							5
						2
	9						6
			1			6
		8			6
	6						2
		1
	7

Difficulty: Easy (0)

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

Difficulty: Very easy (0)