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

Difficulty: Very hard (0)

			1
						3	6
							1
	5						3
	9
	3	8
					2

Difficulty: Very hard (0)

			2
		5
					8		6
			1		7
	9		4
						1
					2

Difficulty: Very hard (0)

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

Difficulty: Very hard (0)