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

Difficulty: Super easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Easy (0)