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

Difficulty: Easy (0)

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

Difficulty: Easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Very easy (0)