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

Difficulty: Very easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Very easy (0)