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

Difficulty: Super easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Very easy (0)