4		2		6
			5
		1
2		4		5

Difficulty: Very easy (0)

	5	3
			2	4
	2	5
			6	3

Difficulty: Super easy (0)

		2
				6
			1		5
3		5
	2
			3

Difficulty: Very hard (0)

		3			4
	4
3
					5
				2
1			4

Difficulty: Very easy (0)