I dunno if this is a good idea for a thread but its seems like a fun idea at this time.
Make you own L4D scenarios you think would be fun.
You first need to start the wheel up, (because everything is broken when zombies come ) and defend the base of the wheel until it's all good and ready.
Only two people can fit in each cart, you'll need to decide what carts to take as a tactical advantage.
Meanwhile, ZOMBIES!
They climb up the wheel to eat you and jump of of a nearby building and hop from cart to cart.
Smoker can go this way
Hunter will climb up.
On harder modes their can be a witch in a cart.
Oh, and clown zombies.
You have to go in a fun house filled with mirrors, filled with zombies, nuff said.
And clown zombies.
You are in a zoo, zombie animals, shit hits fan.