Id make a game like L4D but way better.
20 player online,All coop
Zombies are everywhere and they run at you.
Gameplay is like L4D,fast paced and what not.
Vehicles for sure,IE Tanks but they need gas and gas is scattered throught the city.
City is the size of GTA IV and fully explorable.
You can baracade your self in and hold out.
Special zombies such as Tanks,Smokers all come out at night.
Hunter (Being the Default average Zombie he is in l4d) comes out in day light.
You can customize Vehicles with barbwire and what not.
You can choose to aim down the gun sights for more accurate shooting,or just spray n pray (cause your always gonna be surrounded)
Fully customizeable Guns!,Ie Scopes,Nade Launcher,Silencers.
Customizeable character,with all types of suits,you can be like a Military man with KZ2 helghast helmet,up to 150 piece of clothing for each part of your body.
RPG characters,Ie if you pick Soldier you get better aiming and can run faster,and is stronger,Doctor is better at healing,Civilian is best at baracading.
Up to 2 AI bots can follow you can protect you at times when you want them to.
Zombies will die in 1-2 Shots like in L4D.
