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

Difficulty: Very hard (0)

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

Difficulty: Super easy (0)

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

Difficulty: Very hard (0)

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

Difficulty: Very easy (0)