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

Difficulty: Medium

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

Difficulty: Medium

5	1	7	4			9		10
				11				8
						9	10
					4
7					11		2
							6	2
			3					8
	5		1	3			6

Difficulty: Super easy

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

Difficulty: Medium