100 zombies tips
1st get resources and build barricade 6000 or so
2nd build and silence towers in EVERY available spot with 100+ ammo
3rd let the first wave attack the barricade to give you extra time
4th when all towers are complete enable half of the towers to prevent attacks from both sides
5th when zombies are about to reach the barricade enable all towers which will give you time to clear one side and then focus on the remaining side
Here's mine, I wanted a more unique setting for both design and challenge but, since I have no idea how to actually do either, it might just be the worst map ever, we'll see.