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

Difficulty: Very easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Super easy (0)

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

Difficulty: Very easy (0)