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

Difficulty: Very easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Very hard (0)

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

Difficulty: Super easy (0)