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

Difficulty: Easy (0)

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

Difficulty: Very easy (0)

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

Difficulty: Very hard (0)

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

Difficulty: Very hard (0)