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

Difficulty: Very easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Super easy (0)

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

Difficulty: Easy (0)