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

Difficulty: Very hard (0)

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

Difficulty: Very hard (0)

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

Difficulty: Very easy (0)

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

Difficulty: Super easy (0)