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

Difficulty: Easy (0)

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

Difficulty: Hard (0)

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

Difficulty: Super easy (0)

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

Difficulty: Super easy (0)