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

Difficulty: Super easy (0)

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

Difficulty: Super easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Super easy (0)