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

Difficulty: Easy (0)

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

Difficulty: Easy (0)

					9		3	7
								2
							6
	2
4
5	1		9

Difficulty: Very easy (0)

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

Difficulty: Super hard (187)