I have prepared a good tactics for fiends that came from more than one way and I know that those with level 1 or 2 don't need that as there are only one way that fiends came from and this is easy but as you level up fiends would come from more than one way till they came from 3 ways in level 5 where I am in.
I have played level 5 more than one time but the best tactics that I have got is to add towers that could attack all fiends that they come from the ways and this is by attacking them in a meeting point like what I have done or to add them close to the gate so when fiends come and want to enter the gate you could attack them.
But second strategy carry some risks as fast fiends like bloodlings may escape and enter your gate while you still attacking them so all you need is to add a spell just at the gate to get this strategy but as I have said you can put your towers near a meeting points or in the way corner so you can attack well.
As you can see below it is best to add your towers in the meeting points that all fiends or most of them will pass through and this would help in exposing most fiends to attack from all towers and to be able to pass more waves and losing no hearts.
This is determined by the map you are playing in as you have to read the map will and where ways are met and where are the corners or angles that you could add your towers in to attack a good range while fiends are passing from it in the battle.
