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

Difficulty: Hard (0)

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

Difficulty: Super easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Very easy (0)