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

Difficulty: Very easy (0)

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

Difficulty: Very hard (0)

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

Difficulty: Very hard (0)

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

Difficulty: Super easy (0)