How do you make a nazi zombie map?
Wrong, Yes there is i don't know who decided to post that. There
is a 3D game map developer. You can find it at the link mentioned
below.
You may need to learn a few basic programming skills. But there
is a FULL on tutorial for making maps at Custom Cod(the link is
mentioned below)
Just register and you can find it. Also it gives you step by
step written tutorial for the programming codes.