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

Difficulty: Super easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Easy (0)