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

Difficulty: Very easy (0)

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

Difficulty: Very hard (0)

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

Difficulty: Very easy (0)

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

Difficulty: Very easy (0)