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

Difficulty: Very hard (0)

			2
							4
				9		5
3								9
		8		1
	7
					8

Difficulty: Very hard (0)

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

Difficulty: Very hard (0)

								7
				3				2
		1
		4				5
						9
8				4
4

Difficulty: Very hard (0)