1
				3
			1	4
	6	4
	5
	2

Difficulty: Very easy (0)

2	4
	3		4
		3		1
				6	4

Difficulty: Very hard (0)

			4	2	5
				1
	4
6	5	1

Difficulty: Easy (0)

3		4			2
6
					3
4
					1
1			2		5

Difficulty: Super easy (0)